For example, when his brother, King Hamlet, is killed, Claudius immediately jumps to the conclusion that Hamlet was responsible. He does not investigate the murder or consider any other possible suspects. He also quickly marries his brother's wife, Gertrude, which raises suspicion about his involvement in the murder.
Another example of Claudius's poor handling of a crisis is when he learns that Hamlet is planning to avenge his father's death. Claudius becomes so panicked that he sends Hamlet to England to be killed. This plan backfires, however, and Hamlet eventually returns to Denmark to confront Claudius.
In the end, Claudius's inability to handle crisis leads to his downfall. He is killed by Hamlet in a final confrontation, and the throne of Denmark is restored to its rightful heir.