--- a/dom/canvas/WebGLContextDraw.cpp
+++ b/dom/canvas/WebGLContextDraw.cpp
@@ -355,18 +355,20 @@ WebGLContext::DrawElements_check(GLsizei
     const GLsizei first = byteOffset / bytesPerElem;
     const CheckedUint32 checked_byteCount = bytesPerElem * CheckedUint32(count);
 
     if (!checked_byteCount.isValid()) {
         ErrorInvalidValue("%s: overflow in byteCount", info);
         return false;
     }
 
-    // Any checks below this depend on a program being available.
-    if (!mCurrentProgram) {
+    // Any checks below this depend on mActiveProgramLinkInfo being available.
+    if (!mActiveProgramLinkInfo) {
+        // Technically, this will only be null iff CURRENT_PROGRAM is null.
+        // But it's better to branch on what we actually care about.
         ErrorInvalidOperation("%s: null CURRENT_PROGRAM", info);
         return false;
     }
 
     if (!mBoundVertexArray->mElementArrayBuffer) {
         ErrorInvalidOperation("%s: must have element array buffer binding", info);
         return false;
     }