javascript - Cannot read property push of null -

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For the first time pushing for a child array, which is zero, I am getting this error "property Can not read the push of the tap "But the element is pushed, and for the second time I am completely cured. It is added to the array 

  this.group.departmentsList.push ({name: group.newCategoryName, sort order: group.partners list. Lamp, type: "category"});   
 The group contains the data and the department list is the original array that has been declared as:  
  $ scope.parentDepartment = [[List of departments : [[}]}];    
 
 
 Does not push well into any non-existent array? You can test clearly whether it is not empty and can be made if necessary: ​​ 
  this.group.departmentsList = this.group.departmentsList || []; This.group.departmentsList.push ({name: group.newCategoryName, sortOrder: group.departmentsList.length, type: "category"});

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