be more careful about printing out assertion messages, not all metadata is always present

1 files changed, 1 insertions, 1 deletions

diff --git a/src/library.js b/src/library.js
index 25195415..8e30ba31 100644
--- a/src/library.js
+++ b/src/library.js
@@ -4748,7 +4748,7 @@ LibraryManager.library = {
   },
 
   __assert_func: function(filename, line, func, condition) {
-    throw 'Assertion failed: ' + Pointer_stringify(condition) + ', at: ' + [Pointer_stringify(filename), line, Pointer_stringify(func)];
+    throw 'Assertion failed: ' + (condition ? Pointer_stringify(condition) : 'unknown condition') + ', at: ' + [filename ? Pointer_stringify(filename) : 'unknown filename', line, func ? Pointer_stringify(func) : 'unknown function'];
   },
 
   __cxa_guard_acquire: function(variable) {