diff --git a/qqq-backend-module-rdbms/src/main/java/com/kingsrook/qqq/backend/module/rdbms/actions/AbstractRDBMSAction.java b/qqq-backend-module-rdbms/src/main/java/com/kingsrook/qqq/backend/module/rdbms/actions/AbstractRDBMSAction.java
index 64ffef93..64519687 100644
--- a/qqq-backend-module-rdbms/src/main/java/com/kingsrook/qqq/backend/module/rdbms/actions/AbstractRDBMSAction.java
+++ b/qqq-backend-module-rdbms/src/main/java/com/kingsrook/qqq/backend/module/rdbms/actions/AbstractRDBMSAction.java
@@ -579,6 +579,7 @@ public abstract class AbstractRDBMSAction
                clause = " 0 = 1 ";
                expectedNoOfParams = 0;
             }
+            default -> throw new IllegalStateException("Unexpected operator: " + criterion.getOperator());
          }
 
          if(expectedNoOfParams != null)