The second leg of the European Shield quarter-final between Worcester and Italian side Leonessa was abandoned after 49 minutes due to fog.
The Zurich Premiership side was leading 28-12 following tries from Neil Mason, Craig Gillies, Matt Powell and Ben Hinshelwood before the fog made it impossible to continue the match after 49 minutes.
Worcester already took a 26-point lead to Italy following their first-leg victory at Sixways last week, which they won 32-6.
The ERC Board announced on Sunday that Worcester will progress to the last four.