diff --git a/tools/winscope/src/matrix_utils.js b/tools/winscope/src/matrix_utils.js
index e9cef2afe..cfada074e 100644
--- a/tools/winscope/src/matrix_utils.js
+++ b/tools/winscope/src/matrix_utils.js
@@ -173,6 +173,7 @@ function is_type_flag_clear(transform, bits) {
 }
 
 function multiply_vec2(matrix, x, y) {
+  if (!matrix) return {x, y};
   // |dsdx dsdy  tx|     | x |
   // |dtdx dtdy  ty|  x  | y |
   // |0    0     1 |     | 1 |
diff --git a/tools/winscope/tests/samples/wl_trace.pb b/tools/winscope/tests/samples/wl_trace.pb
new file mode 100644
index 000000000..7e1f0075e
Binary files /dev/null and b/tools/winscope/tests/samples/wl_trace.pb differ