diff --git a/MVMCore/MVMCore/Models/JSON/JSONHelper.swift b/MVMCore/MVMCore/Models/JSON/JSONHelper.swift
index 857310b..002e6a7 100644
--- a/MVMCore/MVMCore/Models/JSON/JSONHelper.swift
+++ b/MVMCore/MVMCore/Models/JSON/JSONHelper.swift
@@ -67,7 +67,10 @@ extension JSONDictionary  {
                 }
                 valueString = baseValueString
             }
-            let queryItem = URLQueryItem(name: key, value: valueString)
+            var characterSet = CharacterSet.urlQueryAllowed
+            characterSet.remove("/")
+            characterSet.remove(":")
+            let queryItem = URLQueryItem(name: key, value: valueString.addingPercentEncoding(withAllowedCharacters: characterSet) ?? valueString)
             queryItems.append(queryItem)
         }
         return queryItems