diff --git a/apps/opm/serializers.py b/apps/opm/serializers.py
index 73b5eaaa..73fe75cd 100644
--- a/apps/opm/serializers.py
+++ b/apps/opm/serializers.py
@@ -64,7 +64,7 @@ class OplWorkerCreateSerializer(CustomModelSerializer):
                 if oplc:
                     pass
                 else:
-                    oplc = OplCert
+                    oplc = OplCert()
                     oplc.opl_worker = oplw
                     oplc.certificate = x
                 for f in Certificate._meta.fields:
@@ -90,7 +90,7 @@ class OplWorkerUpdateSerializer(CustomModelSerializer):
                 if oplc:
                     pass
                 else:
-                    oplc = OplCert
+                    oplc = OplCert()
                     oplc.opl_worker = oplw
                     oplc.certificate = x
                 for f in Certificate._meta.fields: