diff --git a/NodeApp/src/managers/DojoBackendManager.ts b/NodeApp/src/managers/DojoBackendManager.ts
index 64f048e611ad2372d3f6bbda6e5917964f3208f5..7e5c9586aa9e6bcb2a95e50d4947f2c0dbbce94b 100644
--- a/NodeApp/src/managers/DojoBackendManager.ts
+++ b/NodeApp/src/managers/DojoBackendManager.ts
@@ -256,9 +256,9 @@ class DojoBackendManager {
 
         try {
             const response = await axios.post<DojoBackendResponse<Assignment>>(DojoBackendHelper.getApiUrl(ApiRoute.ASSIGNMENT_CREATE), Object.assign({
-                                                                                                                                                          name   : name,
-                                                                                                                                                          members: JSON.stringify(members),
-                                                                                                                                                          useSonar  : sonar
+                                                                                                                                                          name      : name,
+                                                                                                                                                          members   : JSON.stringify(members),
+                                                                                                                                                          useSonar  : String(sonar)
                                                                                                                                                       }, templateIdOrNamespace ? { template: templateIdOrNamespace } : {}));
 
             if ( verbose ) {