Attempt To De-reference a Null Object on a Before Trigger
32065
Attempt to de-reference a null object: Trigger
96843
What will happen when I call a member function on a NULL object pointer?
102259
Custom Validation using Trigger throwing System.FinalException: SObject row does not allow errors
136800
DML statement cannot operate on Trigger.new or Trigger.old
109207
Comparing dates in a BEFORE INSERT trigger
289
What is a NullReferenceException, and how do I fix it?
43578
Event parent relationship fields are null in trigger
64200
Can Java's NullPointerException be changed to report on which variable was null?
48594
What is a good pattern for recursion blocking in generic trigger handlers?
7197
How to write a unit-test / test class for trigger?
126231
How can I manage the onslaught of null checks?
56858
Possible to overload null-coalescing operator?
81827
How to check if a columns value was explicitly specified in a PL/SQL BEFORE UPDATE trigger?
87085
Static variables defined in a trigger
145899
DML Statement in ‘after trigger’ and not in ‘before trigger’?
114816
Is null reference possible?
144658
System.NullPointerException: Attempt to de-reference a null object ,sravn