diff --git a/lib/gui/models/store.js b/lib/gui/models/store.js
index 5855fd5b..173be8de 100644
--- a/lib/gui/models/store.js
+++ b/lib/gui/models/store.js
@@ -133,7 +133,7 @@ const storeReducer = (state, action) => {
         throw new Error(`Invalid state type: ${action.data.type}`);
       }
 
-      if (!action.data.percentage) {
+      if (_.isUndefined(action.data.percentage) || _.isNull(action.data.percentage)) {
         throw new Error('Missing state percentage');
       }
 
diff --git a/tests/gui/modules/image-writer.spec.js b/tests/gui/modules/image-writer.spec.js
index 7e96fdd1..cb0c2f75 100644
--- a/tests/gui/modules/image-writer.spec.js
+++ b/tests/gui/modules/image-writer.spec.js
@@ -120,6 +120,18 @@ describe('Browser: ImageWriter', function() {
         }).to.throw('Invalid state type: 1234');
       });
 
+      it('should not throw if percentage is 0', function() {
+        ImageWriterService.setFlashingFlag();
+        m.chai.expect(function() {
+          ImageWriterService.setProgressState({
+            type: 'write',
+            percentage: 0,
+            eta: 15,
+            speed: 100000000000
+          });
+        }).to.not.throw('Missing state percentage');
+      });
+
       it('should throw if percentage is missing', function() {
         ImageWriterService.setFlashingFlag();
         m.chai.expect(function() {