NPE fix

plugins/org.jkiss.dbeaver.model.sql/src/org/jkiss/dbeaver/model/sql/completion/SQLCompletionAnalyzer.java

@@ -406,7 +406,8 @@ public class SQLCompletionAnalyzer implements DBRRunnableParametrized<DBRProgres
         }
 
         DBSInstance defaultInstance = dataSource == null ? null : dataSource.getDefaultInstance();
-        DBSObject selectedObject = defaultInstance == null ? null : DBUtils.getActiveInstanceObject(request.getContext().getExecutionContext());
+        DBCExecutionContext executionContext = request.getContext().getExecutionContext();
+        DBSObject selectedObject = defaultInstance == null || executionContext == null ? null : DBUtils.getActiveInstanceObject(executionContext);
         boolean hideDups = request.getContext().isHideDuplicates() && selectedObject != null;
         if (hideDups) {
             for (int i = 0; i < proposals.size(); i++) {