Merge pull request #10480 from snipe/fixes/check_for_valid_custom_field

Fixed format property on invalid custom field object when trying to edit a field that doesn't exist

Author: snipe

app/Http/Controllers/CustomFieldsController.php

@@ -178,20 +178,25 @@ public function destroy($field_id)
      */
     public function edit($id)
     {
-        $field = CustomField::find($id);
+        if ($field = CustomField::find($id)) {
 
-        $this->authorize('update', $field);
+            $this->authorize('update', $field);
 
-        $customFormat = '';
-        if((stripos($field->format, 'regex') === 0) && ($field->format !== CustomField::PREDEFINED_FORMATS['MAC'])) {
-            $customFormat = $field->format;
-        }
+            $customFormat = '';
+            if((stripos($field->format, 'regex') === 0) && ($field->format !== CustomField::PREDEFINED_FORMATS['MAC'])) {
+                $customFormat = $field->format;
+            }
 
-        return view("custom_fields.fields.edit",[
-            'field'             => $field,
-            'customFormat'      => $customFormat,
-            'predefinedFormats' => Helper::predefined_formats()
-        ]);
+            return view("custom_fields.fields.edit",[
+                'field'             => $field,
+                'customFormat'      => $customFormat,
+                'predefinedFormats' => Helper::predefined_formats()
+            ]);
+        } 
+
+        return redirect()->route("fields.index")
+            ->with("error", trans('admin/custom_fields/message.field.invalid'));
+        
     }