diff --git a/makefile b/makefile
index 2f42439..350830f 100644
--- a/makefile
+++ b/makefile
@@ -11,6 +11,8 @@ SRC = src/*.d\
 INCLUDE_PATHS = -Ilibdparse/src
 VERSIONS =
 DEBUG_VERSIONS = -version=std_parser_verbose
+DMD_FLAGS = -w -O -release -inline
+#DMD_FLAGS = -w
 
 all: dmdbuild
 ldc: ldcbuild
@@ -24,7 +26,7 @@ debug:
 
 dmdbuild: githash
 	mkdir -p bin
-	${DMD} -w -O -release -inline -ofbin/dscanner ${VERSIONS} ${INCLUDE_PATHS} ${SRC} -J.
+	${DMD}  -ofbin/dscanner ${VERSIONS} ${INCLUDE_PATHS} ${SRC} -J.
 	rm -f bin/dscanner.o
 
 gdcbuild: githash
diff --git a/src/analysis/redundant_parens.d b/src/analysis/redundant_parens.d
index e57ae33..88c8c5f 100644
--- a/src/analysis/redundant_parens.d
+++ b/src/analysis/redundant_parens.d
@@ -29,17 +29,30 @@ class RedundantParenCheck : BaseAnalyzer
 		unary = cast(UnaryExpression) statement.expression.items[0];
 		if (unary is null)
 			goto end;
-		visit(unary.primaryExpression);
+		if (unary.primaryExpression is null)
+			goto end;
+		if (unary.primaryExpression.expression is null)
+			goto end;
+		addErrorMessage(unary.primaryExpression.expression.line,
+			unary.primaryExpression.expression.column, KEY, "Redundant parenthesis");
 	end:
 		statement.accept(this);
 	}
 
 	override void visit(const PrimaryExpression primaryExpression)
 	{
-		if (primaryExpression is null)
-			goto end;
+		import std.stdio : stderr;
+
+		UnaryExpression unary;
 		if (primaryExpression.expression is null)
 			goto end;
+		unary = cast(UnaryExpression) primaryExpression.expression.items[0];
+		if (unary is null)
+			goto end;
+		if (unary.primaryExpression is null)
+			goto end;
+		if (unary.primaryExpression.expression is null)
+			goto end;
 		addErrorMessage(primaryExpression.expression.line,
 			primaryExpression.expression.column, KEY, "Redundant parenthesis");
 	end: