MeShClust terminates due to mean1 is zero

[yaohaobin]

My input sequences are assembled contigs (1000bp to over 300k). During running MeShClust, the program terminates:
Statistician warning at harmonicMeanRSimilarity. A sequence is too short. Similarity is assigned zero. (many such lines)
Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: Mean 1 is: 0, mean 2 is: 0.269531

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.105957

0, mean 2 is: 0.149414

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.223145

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.109619

0, mean 2 is: 0.115234

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.11377

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.196045

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: 0, mean 2 is: 0.311768

Mean 1 (mean1) and Mean 2 (mean2) cannot be zeros. Mean 1 is: terminate called recursively
terminate called recursively
terminate called recursively
terminate called recursively