Fixing a small leak on propane burner

Did a leak test on my outdoor portable double propane burner stove, and there is a small leak at the inlet (circled in red above), where the gold colored metal meets the black pipe.

Obviously I have not turned on the ignition since I detected this. Thankfully I do the soap test periodically.

Is it possible to use some kind of patching material to stop this leak? Any recommendations for a fix? It is out of warranty.

Thanks!

by rizalvy