@@ -2750,6 +2750,9 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL
                             output.clear();
                             return;
                         }
+                        if (!tmp)
+                            break;
+                        tok = tmp->previous;
                     }
                     try {
                         conditionIsTrue = (evaluate(expr, sizeOfType) != 0);
 
@@ -1001,6 +1001,15 @@ static void ifalt()   // using "and", "or", etc
     ASSERT_EQUALS("\n1", preprocess(code));
 }
 
+static void ifexpr()
+{
+    const char *code = "#define MACRO()  (1)\n"
+                       "#if ~MACRO() & 8\n"
+                       "1\n"
+                       "#endif";
+    ASSERT_EQUALS("\n\n1", preprocess(code));
+}
+
 static void location1()
 {
     const char *code;
@@ -1903,6 +1912,7 @@ int main(int argc, char **argv)
     TEST_CASE(ifoverflow);
     TEST_CASE(ifdiv0);
     TEST_CASE(ifalt); // using "and", "or", etc
+    TEST_CASE(ifexpr);
 
     TEST_CASE(location1);
     TEST_CASE(location2);
Original file line number	Diff line number	Diff line change
`@@ -2750,6 +2750,9 @@ void simplecpp::preprocess(simplecpp::TokenList &output, const simplecpp::TokenL`
`2750`	`2750`	`output.clear();`
`2751`	`2751`	`return;`
`2752`	`2752`	`}`
	`2753`	`+ if (!tmp)`
	`2754`	`+ break;`
	`2755`	`+ tok = tmp->previous;`
`2753`	`2756`	`}`
`2754`	`2757`	`try {`
`2755`	`2758`	`conditionIsTrue = (evaluate(expr, sizeOfType) != 0);`