diff --git a/java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java b/java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java
index d7a60cc4cb88..b75d6687f8ac 100644
--- a/java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java
+++ b/java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java
@@ -447,7 +447,7 @@ public class TypeConversionUtil {
     return PsiType.VOID.equals(type);
   }
 
-  public static boolean isBooleanType(PsiType type) {
+  public static boolean isBooleanType(@Nullable PsiType type) {
     return PsiType.BOOLEAN.equals(type) || PsiType.BOOLEAN.equals(PsiPrimitiveType.getUnboxedType(type));
   }