'java.lang.String java.lang.Object.toString ()' on a null object reference (Firebase)
49
What is a NullPointerException, and how do I fix it?
58054
When is it OK to catch NullPointerException?
10818
NullPointerException : println needs a message in android
20892
C# nullable string error
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
96046
Static fields on a null reference in Java
127452
Why is typeof null "object"?
138823
Why cast null to Object?
8793
Android and getting a view with id cast as a string
87189
System.NullPointerException
4619
Converting an object to a string
20020
NullPointerException accessing views in onCreate()
32065
Attempt to de-reference a null object: Trigger
92187
Unable to cast object of type 'System.DBNull' to type 'System.String`
64332
avoiding null reference exceptions
43769
How do I Parameterize a null string with DBNull.Value clearly and quickly
46944
Null pointer Exception - findViewById()