"One entered his property, without permission, to ask questions and Webster pushed him away."
Webster pleaded guilty to behaving in a disorderly matter after being charged with the offence but pleaded not guilty to a charge of assaulting a police officer in the execution of his duty and possession of an offensive weapon.
However, he was convicted after a trial - a decision Webster appealed.
Palmer said the judgment under appeal did not identify the lawfulness of the constable's presence on Webster's property.
"I do not consider the constable was lawfully on the property and, therefore, he was not in the execution of his duty," he said.
"Neither did the judgment under appeal identify the legal definition of an offensive weapon or provide any reasoning about whether its possession was proved.
"I do not consider the evidence sustains, beyond a reasonable doubt, that the metal pole was intended by Webster for the use of causing bodily injury or that he had no reasonable excuse to hold it."
In response to his findings, Justice Palmer said a miscarriage of justice had taken place and quashed both of Webster's convictions.