1 files changed, 20 insertions, 16 deletions
diff --git a/src/wasm-s-parser.h b/src/wasm-s-parser.h
index 8f5e08e9d..ec7d6c6dc 100644
--- a/src/wasm-s-parser.h
+++ b/src/wasm-s-parser.h
@@ -1090,23 +1090,27 @@ private:
     im->module = s[2]->str();
     if (!s[3]->isStr()) onError();
     im->base = s[3]->str();
-    Element& params = *s[4];
-    IString id = params[0]->str();
-    if (id == PARAM) {
-      for (size_t i = 1; i < params.size(); i++) {
-        im->type.params.push_back(stringToWasmType(params[i]->str()));
+    if (s.size() > 4) {
+      Element& params = *s[4];
+      IString id = params[0]->str();
+      if (id == PARAM) {
+        for (size_t i = 1; i < params.size(); i++) {
+          im->type.params.push_back(stringToWasmType(params[i]->str()));
+        }
+      } else if (id == RESULT) {
+        im->type.result = stringToWasmType(params[1]->str());
+      } else if (id == TYPE) {
+        IString name = params[1]->str();
+        assert(wasm.functionTypesMap.find(name) != wasm.functionTypesMap.end());
+        im->type = *wasm.functionTypesMap[name];
+      } else {
+        onError();
+      }
+      if (s.size() > 5) {
+        Element& result = *s[5];
+        assert(result[0]->str() == RESULT);
+        im->type.result = stringToWasmType(result[1]->str());
       }
-    } else if (id == TYPE) {
-      IString name = params[1]->str();
-      assert(wasm.functionTypesMap.find(name) != wasm.functionTypesMap.end());
-      im->type = *wasm.functionTypesMap[name];
-    } else {
-      onError();
-    }
-    if (s.size() > 5) {
-      Element& result = *s[5];
-      assert(result[0]->str() == RESULT);
-      im->type.result = stringToWasmType(result[1]->str());
     }
     wasm.addImport(im);
   }