First::nofirst: {} has zero length and no first element.

Your Mathematica version

11.3.0 for Linux x86 (64-bit) (March 7, 2018)
Your FeynCalc version

9.2.0
Did you try to reinstall FeynCalc (stable version) using the automatic installer to make sure that you have the latest bugfixes?

Yes
Please provide a minimal working example that illustrates the problem. Please explain the difference between the current behavior and the expected behavior.
```
$LoadFeynArts=True;
<<FeynCalc`
$FAVerbose = 0;
FAPatch[PatchModelsOnly -> True]
```
When I ran the codes above, Mathematica returned an error to me
```
First::nofirst: {} has zero length and no first element.
```
And when I ran without FAPatch[PatchModelsOnly -> True] , that is
```
$LoadFeynArts=True;
<<FeynCalc`
$FAVerbose = 0;
```
No error returned. Maybe, there is a bug in FAPatch[PatchModelsOnly -> True]

Best wishes!

FeynCalc / feyncalc