diff --git a/plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/editors/sql/indent/SQLAutoIndentStrategy.java b/plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/editors/sql/indent/SQLAutoIndentStrategy.java
index e259254504850cdeadc82213014143191eedbb6f..af0ca5b8959d6ffdd43646e7db8d600fcb24154b 100644
--- a/plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/editors/sql/indent/SQLAutoIndentStrategy.java
+++ b/plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/ui/editors/sql/indent/SQLAutoIndentStrategy.java
@@ -105,6 +105,9 @@ public class SQLAutoIndentStrategy extends DefaultIndentLineAutoEditStrategy {
                 return false;
             }
         }
+        if (quoteStart == -1 || quoteEnd == -1) {
+            return false;
+        }
         StringBuilder result = new StringBuilder(sourceCode.length());
         char prevChar = (char)-1;
         boolean inString = true;