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-rw-r--r--src/webGLWorker.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/webGLWorker.js b/src/webGLWorker.js
index cbf5ec74..6416add9 100644
--- a/src/webGLWorker.js
+++ b/src/webGLWorker.js
@@ -559,6 +559,7 @@ function WebGLWorker() {
this.getAttribLocation = function(program, name) {
// manually bound attribs are cached locally
if (name in program.attributes) return program.attributes[name];
+ if (!(name in program.existingAttributes)) return -1;
// if not manually bound, bind it to the next index so we update the client
var index = program.attributeVec.length;
this.bindAttribLocation(program, index, name);