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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,15 @@ public void loadFromGtfs (GTFSFeed gtfs, TransitLayer.LoadLevel level) throws Du
throw new DuplicateFeedException(gtfs.feedId);
}

if (gtfs.patterns.isEmpty()) {
throw new IllegalArgumentException(
String.format(
"Feed %s has no patterns, which means it is either empty or contains errors. Consider using validate_gtfs from {gtfstools}.",
gtfs.feedId
)
);
}

// checksum feed and add to checksum cache
feedChecksums.put(gtfs.feedId, gtfs.checksum);

Expand Down