diff --git a/kiauh.sh b/kiauh.sh
index 200b427..670707e 100755
--- a/kiauh.sh
+++ b/kiauh.sh
@@ -63,7 +63,7 @@ get_date(){
   current_date=$(date +"%Y-%m-%d_%H-%M")
 }
 print_unkown_cmd(){
-  ERROR_MSG=" Sorry i don't know that command!"
+  ERROR_MSG="Invalid command!"
 }
 
 print_msg(){
diff --git a/scripts/functions.sh b/scripts/functions.sh
index 7202f52..2bc71de 100755
--- a/scripts/functions.sh
+++ b/scripts/functions.sh
@@ -222,7 +222,11 @@ remove_branding(){
         ok_msg "Clear browser cache and reload Mainsail (F5)!"
         echo
         break;;
-      N|n|No|no) break;;
+      N|n|No|no)
+        break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
@@ -258,6 +262,9 @@ install_extension_shell_command(){
         break;;
       N|n|No|no)
         break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
diff --git a/scripts/install_dwc2.sh b/scripts/install_dwc2.sh
index dd1e07c..f7651d9 100755
--- a/scripts/install_dwc2.sh
+++ b/scripts/install_dwc2.sh
@@ -81,9 +81,12 @@ get_user_selections_dwc2(){
           echo -e "###### > Skip"
           SEL_DEF_CFG="false"
           SEL_CUS_CFG="false"
-          echo "${red}Skipping ...${default}"; break;;
+          echo "${red}Skipping ...${default}"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   #
@@ -107,12 +110,16 @@ get_user_selections_dwc2(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          DISABLE_OPRINT="true";;
+          DISABLE_OPRINT="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          DISABLE_OPRINT="false";;
+          DISABLE_OPRINT="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   status_msg "Installation will start now! Please wait ..."
@@ -328,6 +335,9 @@ DWC2
         CONFIRM_CUSTOM_CFG="false"
         create_custom_dwc2_printer_cfg
         break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
@@ -352,6 +362,9 @@ dwc2_reverse_proxy_dialog(){
       N|n|No|no|"")
         SET_REVERSE_PROXY="false"
         break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
\ No newline at end of file
diff --git a/scripts/install_klipper.sh b/scripts/install_klipper.sh
index b693e10..ef476ef 100755
--- a/scripts/install_klipper.sh
+++ b/scripts/install_klipper.sh
@@ -25,6 +25,9 @@ get_user_selections_klipper(){
           echo -e "###### > No"
           BUILD_FIRMWARE="false"
           break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
     esac
   done
   #ask user for flashing mcu
@@ -41,6 +44,9 @@ get_user_selections_klipper(){
           echo -e "###### > No"
           FLASH_FIRMWARE="false"
           break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
     esac
   done
 }
@@ -93,6 +99,9 @@ flash_routine(){
           CONFIRM_FLASHING="false"
           CONFIRM_WRITE_PRINTER_USB="false"
           break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
     done
   fi
diff --git a/scripts/install_moonraker.sh b/scripts/install_moonraker.sh
index a2e9662..909452f 100755
--- a/scripts/install_moonraker.sh
+++ b/scripts/install_moonraker.sh
@@ -81,12 +81,16 @@ get_user_selections_moonraker(){
     case "$yn" in
       Y|y|Yes|yes|"")
         echo -e "###### > Yes"
-        INST_MAINSAIL="true";;
+        INST_MAINSAIL="true"
+        break;;
       N|n|No|no)
         echo -e "###### > No"
-        INST_MAINSAIL="false";;
+        INST_MAINSAIL="false"
+        break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
-    break
   done
   #ask to change hostname if mainsail should be installed as well
   if [ "$INST_MAINSAIL" = "true" ]; then
@@ -110,12 +114,16 @@ get_user_selections_moonraker(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          SEL_DEF_CFG="true";;
+          SEL_DEF_CFG="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          SEL_DEF_CFG="false";;
+          SEL_DEF_CFG="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   #user selection for moonraker.log symlink
@@ -126,12 +134,16 @@ get_user_selections_moonraker(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          SEL_KLIPPYLOG_SL="true";;
+          SEL_KLIPPYLOG_SL="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          SEL_KLIPPYLOG_SL="false";;
+          SEL_KLIPPYLOG_SL="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   #user selection for moonraker.log symlink
@@ -142,12 +154,16 @@ get_user_selections_moonraker(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          SEL_MRLOG_SL="true";;
+          SEL_MRLOG_SL="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          SEL_MRLOG_SL="false";;
+          SEL_MRLOG_SL="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   #ask user for more trusted clients
@@ -163,12 +179,15 @@ get_user_selections_moonraker(){
           echo -e "###### > Yes"
           ADD_TRUSTED_CLIENT="true"
           custom_trusted_clients
-          ;;
+          break;;
         N|n|No|no|"")
           echo -e "###### > No"
-          ADD_TRUSTED_CLIENT="false";;
+          ADD_TRUSTED_CLIENT="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   #ask user for mainsail default macros
     while true; do
@@ -178,12 +197,16 @@ get_user_selections_moonraker(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          ADD_MS_MACROS="true";;
+          ADD_MS_MACROS="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          ADD_MS_MACROS="false";;
+          ADD_MS_MACROS="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   #ask user to disable octoprint when such installed service was found
   if [ "$OCTOPRINT_ENABLED" = "true" ]; then
@@ -198,12 +221,16 @@ get_user_selections_moonraker(){
       case "$yn" in
         Y|y|Yes|yes|"")
           echo -e "###### > Yes"
-          DISABLE_OPRINT="true";;
+          DISABLE_OPRINT="true"
+          break;;
         N|n|No|no)
           echo -e "###### > No"
-          DISABLE_OPRINT="false";;
+          DISABLE_OPRINT="false"
+          break;;
+        *)
+          print_unkown_cmd
+          print_msg && clear_msg;;
       esac
-      break
     done
   fi
   #notify user about haproxy or lighttpd services found and possible issues
@@ -541,7 +568,9 @@ custom_trusted_clients(){
             esac
           done
           break;;
-        *) trusted_arr+=($TRUSTED_IP);;
+        *)
+          trusted_arr+=($TRUSTED_IP)
+          break;;
       esac
     done
   fi
diff --git a/scripts/install_octoprint.sh b/scripts/install_octoprint.sh
index cc049ba..0df8495 100755
--- a/scripts/install_octoprint.sh
+++ b/scripts/install_octoprint.sh
@@ -133,6 +133,9 @@ octoprint_reverse_proxy_dialog(){
       N|n|No|no|"")
         SET_REVERSE_PROXY="false"
         break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
diff --git a/scripts/remove.sh b/scripts/remove.sh
index 558b8b6..8390d4b 100755
--- a/scripts/remove.sh
+++ b/scripts/remove.sh
@@ -87,6 +87,9 @@ remove_moonraker(){
             echo -e "###### > No"
             REMOVE_MOONRAKER_CONF="false"
             break;;
+          *)
+            print_unkown_cmd
+            print_msg && clear_msg;;
         esac
       done
     fi
diff --git a/scripts/rollback.sh b/scripts/rollback.sh
index a61c049..713364f 100755
--- a/scripts/rollback.sh
+++ b/scripts/rollback.sh
@@ -83,6 +83,9 @@ rollback_klipper(){
             break;;
           N|n|No|no) clear; advanced_menu; break;;
           Q|q) clear; advanced_menu; break;;
+          *)
+            print_unkown_cmd
+            print_msg && clear_msg;;
       esac
     done
   else
diff --git a/scripts/set_reverse_proxy.sh b/scripts/set_reverse_proxy.sh
index b9164a1..f024801 100755
--- a/scripts/set_reverse_proxy.sh
+++ b/scripts/set_reverse_proxy.sh
@@ -41,6 +41,9 @@ create_custom_hostname(){
         user_input_hostname
         break;;
       N|n|No|no|"") break;;
+      *)
+        print_unkown_cmd
+        print_msg && clear_msg;;
     esac
   done
 }
@@ -73,6 +76,9 @@ user_input_hostname(){
               echo -e "${red}Skip hostname change ...${default}"
               HOSTENAME_CONFIRM="false"
               break;;
+            *)
+              print_unkown_cmd
+              print_msg && clear_msg;;
           esac
         done
       break