Cannot toggle Heat Map

Error: unresolvable: DOM Exception: NO_MODIFICATION_ALLOWED_ERR (7) 

Error: unresolvable: Argument 1 of SVGGraphicsElement.getBBox can't be converted to a dictionary.
asyncLoad/promise<@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:108140:27
qFactory/defer/deferred.promise.then/wrappedCallback@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:11723:31
qFactory/ref/<.then/<@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:11809:26
$RootScopeProvider/this.$get</Scope.prototype.$eval@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12852:16
$RootScopeProvider/this.$get</Scope.prototype.$digest@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12664:15
$RootScopeProvider/this.$get</Scope.prototype.$apply@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12956:13
timeout/timeoutId<@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:14467:25
completeOutstandingRequest@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:4414:7
Browser/self.defer/timeoutId<@http://localhost:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:4735:7

:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:10148 Error: unresolvable: u._viewport.image is not a function
    at :7001/camunda/lib/deps.js?bust=7.6.0-alpha6:108140
    at wrappedCallback (:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:11723)
    at :7001/camunda/lib/deps.js?bust=7.6.0-alpha6:11809
    at Scope.$eval (:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12852)
    at Scope.$digest (:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12664)
    at Scope.$apply (:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:12956)
    at :7001/camunda/lib/deps.js?bust=7.6.0-alpha6:14467
    at completeOutstandingRequest (:7001/camunda/lib/deps.js?bust=7.6.0-alpha6:4414)
    at :7001/camunda/lib/deps.js?bust=7.6.0-alpha6:4735