intercept queue concurrency of 0

2 files changed, 10 insertions, 0 deletions

diff --git a/lib/async.js b/lib/async.js
index 47ab5a7..81916fd 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -886,6 +886,9 @@
         if (concurrency === undefined) {
             concurrency = 1;
         }
+        else if(concurrency === 0) {
+            throw new Error('Concurrency must not be zero');
+        }
         function _insert(q, data, pos, callback) {
           if (!q.started){
             q.started = true;
diff --git a/test/test-async.js b/test/test-async.js
index 6f6a741..64c33f9 100755
--- a/test/test-async.js
+++ b/test/test-async.js
@@ -2453,6 +2453,13 @@ exports['queue default concurrency'] = function (test) {
     };
 };
 
+exports['queue zero concurrency'] = function(test){
+    test.throws(function () {
+        async.queue(function (task, callback) {}, 0);
+    });
+    test.done();
+};
+
 exports['queue error propagation'] = function(test){
     var results = [];