1 files changed, 15 insertions, 7 deletions
diff --git a/src/gc.cpp b/src/gc.cpp
index e6a296b..6655e40 100644
--- a/src/gc.cpp
+++ b/src/gc.cpp
@@ -81,14 +81,22 @@ GC::collect(const Roots& roots)
 		Heap::iterator next = i;
 		++next;
 
-		if ((*i)->marked()) {
-			(*i)->mark(false);
-			assert(!(*i)->marked());
-		} else {
-			tlsf_free((tlsf_t*)_pool, ((char*)(*i) - sizeof(Object::Header)));
-			_heap.erase(i);
+		switch ((*i)->tag()) {
+		case T_UNKNOWN:
+		case T_TVAR:
+		case T_SYMBOL:
+			i = next;
+			continue;
+		default:
+			if ((*i)->marked()) {
+				(*i)->mark(false);
+				assert(!(*i)->marked());
+			} else {
+				tlsf_free((tlsf_t*)_pool, ((char*)(*i) - sizeof(Object::Header)));
+				_heap.erase(i);
+			}
+			i = next;
 		}
-		i = next;
 	}
 
 	//std::cerr << "[GC] Collect " << oldSize << " => " << _heap.size() << endl;