TypeError: vm.session.source.match is not a function

[HarryF514]

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protractor --version
Version 5.1.2

angular.js:14199 TypeError: vm.session.source.match is not a function
    at MainController.getNgIncludes (main.controller.js:786)
    at main.controller.js:765
    at angular.js:11728
    at processQueue (angular.js:16696)
    at angular.js:16712
    at Scope.$eval (angular.js:17994)
    at Scope.$digest (angular.js:17808)
    at Scope.$apply (angular.js:18102)
    at done (angular.js:12082)
    at completeRequest (angular.js:12291)