Dear all, I developed a tool which allows an optional selection as input amongst others. It works quite neat if I run it via "Analyse Data". Actually, it only breaks in one condition: If I try to run it "as a Workflow" and set the "multiple selection input" to be set at runtime AND do not select anything at runtime it'll raise a Cheetah error. Even if I select nothing but prior to runtime as workflow it works fine again. The multiple selection is based on a data table/ loc-file. Any ideas? Cheers, Christan relevant tool specification snippet: --------------------------------------------- [...] <param [...] type="select" optional="true" multiple="true" display="checkboxes" [...]> <options from_data_table="fmi_[...]"/> </param> [...] Cheetah error: -------------------- Traceback (most recent call last): File "[...]/galaxy/galaxy_dist/lib/galaxy/jobs/runners/__init__.py", line 123, in prepare_job job_wrapper.prepare() File "[...]/galaxy/galaxy_dist/lib/galaxy/jobs/__init__.py", line 702, in prepare self.command_line = self.tool.build_command_line( param_dict ) File "[...]/galaxy/galaxy_dist/lib/galaxy/tools/__init__.py", line 2639, in build_command_line command_line = fill_template( self.command, context=param_dict ) File "[...]/galaxy/galaxy_dist/lib/galaxy/util/template.py", line 9, in fill_template return str( Template( source=template_text, searchList=[context] ) ) File "[...]/galaxy/galaxy_dist/eggs/Cheetah-2.2.2-py2.6-linux-x86_64-ucs4.egg/Cheetah/Template.py", line 1004, in __str__ return getattr(self, mainMethName)() File "cheetah_DynamicallyCompiledCheetahTemplate_1391423600_85_54475.py", line 89, in respond File "cheetah_DynamicallyCompiledCheetahTemplate_1391423600_85_54475.py", line 89, in <lambda> IndexError: list index out of range Galaxy: ---------- changeset: 11219:5c789ab4144a branch: stable