diff --git a/src/main/java/com/github/_1c_syntax/bsl/languageserver/diagnostics/RefOveruseDiagnostic.java b/src/main/java/com/github/_1c_syntax/bsl/languageserver/diagnostics/RefOveruseDiagnostic.java
index 0371f8a5608..0029f2548c9 100644
--- a/src/main/java/com/github/_1c_syntax/bsl/languageserver/diagnostics/RefOveruseDiagnostic.java
+++ b/src/main/java/com/github/_1c_syntax/bsl/languageserver/diagnostics/RefOveruseDiagnostic.java
@@ -248,6 +248,7 @@ private List<String> getTabularSectionNames(SDBLParser.MdoContext mdo) {
       .map(configuration::findChild)
       .filter(Optional::isPresent)
       .map(Optional::get)
+      .filter(TabularSectionOwner.class::isInstance)
       .map(TabularSectionOwner.class::cast)
       .flatMap(RefOveruseDiagnostic::getTabularSectionNames)
       .collect(Collectors.toList());