firebase/leaflet google tile layer issue

console.log

firebase.amd.js:842 FIREBASE WARNING: Exception was thrown by user callback. TypeError: Cannot read property 'call' of undefined
    at NewClass.whenReady (http://localhost:4200/assets/vendor.js:133507:12)
    at NewClass.addLayer (http://localhost:4200/assets/vendor.js:133923:8)
    at Class.addToContainer (http://localhost:4200/assets/vendor.js:173362:42)
    at Class.didInsertParent (http://localhost:4200/assets/vendor.js:173353:14)
    at Array.<anonymous> (http://localhost:4200/assets/vendor.js:47670:36)
    at Array.forEach (native)
    at Array.invoke (http://localhost:4200/assets/vendor.js:47666:12)
    at Class.invokeChildDidInsertHooks (http://localhost:4200/assets/vendor.js:152641:28)
    at Class.didInsertElement (http://localhost:4200/assets/vendor.js:152615:14)
    at Class.superWrapper [as didInsertElement] (http://localhost:4200/assets/vendor.js:54681:22) 
    
Map.js:1355 Uncaught TypeError: Cannot read property 'call' of undefined
    at NewClass.whenReady (http://localhost:4200/assets/vendor.js:133507:12)
    at NewClass.addLayer (http://localhost:4200/assets/vendor.js:133923:8)
    at Class.addToContainer (http://localhost:4200/assets/vendor.js:173362:42)
    at Class.didInsertParent (http://localhost:4200/assets/vendor.js:173353:14)
    at Array.<anonymous> (http://localhost:4200/assets/vendor.js:47670:36)
    at Array.forEach (native)
    at Array.invoke (http://localhost:4200/assets/vendor.js:47666:12)
    at Class.invokeChildDidInsertHooks (http://localhost:4200/assets/vendor.js:152641:28)
    at Class.didInsertElement (http://localhost:4200/assets/vendor.js:152615:14)
    at Class.superWrapper [as didInsertElement] (http://localhost:4200/assets/vendor.js:54681:22)
whenReady @ Map.js:1355
addLayer @ Layer.js:164
addToContainer @ base-layer.js:97
didInsertParent @ base-layer.js:88
(anonymous) @ ember.debug.js:32625
invoke @ ember.debug.js:32621
invokeChildDidInsertHooks @ parent.js:54
didInsertElement @ parent.js:28
superWrapper @ ember.debug.js:39636
trigger @ ember.debug.js:41454
superWrapper @ ember.debug.js:39636
didCreate @ ember.debug.js:12176
commit @ ember.debug.js:50574
commit @ ember.debug.js:8826
_renderRoots @ ember.debug.js:11609
_renderRootsTransaction @ ember.debug.js:11638
_renderRoot @ ember.debug.js:11559
_appendDefinition @ ember.debug.js:11472
appendOutletView @ ember.debug.js:11455
invoke @ ember.debug.js:337
flush @ ember.debug.js:407
flush @ ember.debug.js:531
end @ ember.debug.js:601
run @ ember.debug.js:724
run @ ember.debug.js:21514
(anonymous) @ firebase.js:137
c @ firebase.amd.js:1025
(anonymous) @ firebase.amd.js:985
fc @ firebase.amd.js:849
bf @ firebase.amd.js:914
cf @ firebase.amd.js:913
g.Gb @ firebase.amd.js:1004
g.wd @ firebase.amd.js:968
og.wd @ firebase.amd.js:958
(anonymous) @ firebase.amd.js:956
ag @ firebase.amd.js:940
Ia.onmessage @ firebase.amd.js:939