Flexbar module is broken

[adomingues]

Description of bug:

A warning message is generated after running multiqc:

Oops! The 'flexbar' MultiQC module broke..

MultiQC Error log:

multiqc -o ${PRJ_RESULTS}/multiqc .
[INFO   ]         multiqc : This is MultiQC v1.10.1
[INFO   ]         multiqc : Template    : default
[INFO   ]         multiqc : Searching   : /mnt/projects/genomics/projects/RBM20_clip/results
Searching   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 100% 550/550  
[INFO   ]            star : Found 8 reports
[INFO   ]         bowtie2 : Found 3 reports
[ERROR  ]         multiqc : Oops! The 'flexbar' MultiQC module broke... 
  Please copy the following traceback and report it at https://github.com/ewels/MultiQC/issues 
  If possible, please include a log file that triggers the error - the last file found was:
    ./processed_reads/flexbar/raw_rbm20_6sg_NH_HM_04.log
============================================================
Module flexbar raised an exception: Traceback (most recent call last):
  File "/mnt/genomics/envs/multiqc/lib/python3.6/site-packages/multiqc/multiqc.py", line 594, in run
    output = mod()
  File "/mnt/genomics/envs/multiqc/lib/python3.6/site-packages/multiqc/modules/flexbar/flexbar.py", line 31, in __init__
    self.parse_flexbar(f)
  File "/mnt/genomics/envs/multiqc/lib/python3.6/site-packages/multiqc/modules/flexbar/flexbar.py", line 94, in parse_flexbar
    _save_data(parsed_data)
  File "/mnt/genomics/envs/multiqc/lib/python3.6/site-packages/multiqc/modules/flexbar/flexbar.py", line 64, in _save_data
    float(parsed_data["removed_bases"]) / float(parsed_data["processed_bases"])
ZeroDivisionError: float division by zero
============================================================
[INFO   ]          fastqc : Found 10 reports
[INFO   ]         multiqc : Compressing plot data
[INFO   ]         multiqc : Report      : ../../../../../genomics/projects/results/multiqc/multiqc_report.html
[INFO   ]         multiqc : Data        : ../../../../../genomics/projects/results/multiqc/multiqc_data
[INFO   ]         multiqc : MultiQC complete

File that triggers the error:

MultiQC run details (please complete the following):

• Command used to run MultiQC: multiqc -o ${PRJ_RESULTS}/multiqc .
• MultiQC Version: MultiQC v1.10.1
• Operating System: Ubuntu 20.04
• Python Version: Python 3.6.13
• Method of MultiQC installation: conda

Additional context

[ewels]

Thanks for reporting! Please can you zip and attach ./processed_reads/flexbar/raw_rbm20_6sg_NH_HM_04.log so that I can try to replicate this to find the problem 😄

[ewels]

(I guess that this sample has zero reads in it)

[adomingues]

You are right - not reads in it. I think this was a reliq from a previously failed test. Attached nonetheless.

raw_rbm20_6sg_NH_HM_04.zip

[ewels]

Thanks! Yes still good to handle it rather than crashing 👍🏻

[ewels]

Ok, should be fixed in the development version now, done in 4d3fd1c. It just sets the % removed bases to 0 if there are zero total reads.

Let me know if you hit any other problems. Thanks for reporting!

[adomingues]

Cheers!