original_query: What was the claim made by Sapir that brought him into conflict with Goddard?
query: What claim by Sapir regarding Athabaskan languages caused conflict with Goddard?
answer: Sapir claimed that Sarsi, an Athabaskan language, had a tonal system fundamental to its understanding, implying other Athabaskan dialects would share it, contradicting Goddard's findings of no tonal contrasts in California Athabaskan, Navajo, Apache, or several Canadian languages.