Add null checks to prevent NullReferenceException

Related rules

From the same buckets as this rule.

• Critical

  Avoid equality operators in loop termination conditions

  Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.

  error-handlingreadability-refactor
• Critical

  Avoid Returning Null in Non-Async Task Methods

  Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.

  error-handlingreadability-refactor+1
• Critical

  Avoid Using Boolean Expressions in `except` Statements

  Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.

  error-handlingstack-python