diff --git a/apps/mina-sidor-fa/src/app/pages/deltagare/pages/deltagare-details/pages/deltagare-reports/franvaro-report/franvaro-report.validator.ts b/apps/mina-sidor-fa/src/app/pages/deltagare/pages/deltagare-details/pages/deltagare-reports/franvaro-report/franvaro-report.validator.ts
index b742122..4bbd21d 100644
--- a/apps/mina-sidor-fa/src/app/pages/deltagare/pages/deltagare-details/pages/deltagare-reports/franvaro-report/franvaro-report.validator.ts
+++ b/apps/mina-sidor-fa/src/app/pages/deltagare/pages/deltagare-details/pages/deltagare-reports/franvaro-report/franvaro-report.validator.ts
@@ -1,5 +1,6 @@
 import { AbstractControl, ValidatorFn } from '@angular/forms';
 import { ANNAN_KAND_ORSAK_ID, ANNAN_ORSAK_ID } from '@msfa-constants/franvaro-reasons';
+import { CHARACTER_REGEX } from '@msfa-constants/regex';
 import { Franvaro } from '@msfa-models/franvaro.model';
 
 const TIME_REGEX = /^([0-1]?[0-9]|2[0-4]):([0-5][0-9])(:[0-5][0-9])?$/;
@@ -36,11 +37,18 @@ export class FranvaroReportValidator {
             ...errors,
             otherKnownReason: 'Känd orsak måste väljas',
           };
-        } else if (otherKnownReason === ANNAN_ORSAK_ID && !knownReasonComment) {
-          errors = {
-            ...errors,
-            knownReasonComment: 'Beskrivning av frånvaro är obligatorisk',
-          };
+        } else if (otherKnownReason === ANNAN_ORSAK_ID) {
+          if (!knownReasonComment) {
+            errors = {
+              ...errors,
+              knownReasonComment: 'Beskrivning av frånvaro är obligatorisk',
+            };
+          } else if (!CHARACTER_REGEX.test(knownReasonComment)) {
+            errors = {
+              ...errors,
+              knownReasonComment: 'Beskrivning av frånvaro har en ogiltig värde',
+            };
+          }
         }
       }
       if (!date) {