diff --git a/.buildlibrary b/.buildlibrary
index aef1bf8..1897b6e 100644
--- a/.buildlibrary
+++ b/.buildlibrary
@@ -1,4 +1,4 @@
-ValidationKey: '62541725'
+ValidationKey: '62608680'
 AcceptedWarnings:
 - 'Warning: package ''.*'' was built under R version'
 - 'Warning: namespace ''.*'' is not available and has been replaced'
diff --git a/CITATION.cff b/CITATION.cff
index 865fe41..69486bf 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: If you use this software, please cite it using the metadata from this file.
 type: software
 title: 'madrat: May All Data be Reproducible and Transparent (MADRaT) *'
-version: 3.13.1
-date-released: '2024-09-09'
+version: 3.13.2
+date-released: '2024-09-24'
 abstract: Provides a framework which should improve reproducibility and transparency
   in data processing. It provides functionality such as automatic meta data creation
   and management, rudimentary quality management, data caching, work-flow management
diff --git a/DESCRIPTION b/DESCRIPTION
index 230be3e..40b0c54 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Type: Package
 Package: madrat
 Title: May All Data be Reproducible and Transparent (MADRaT) *
-Version: 3.13.1
-Date: 2024-09-09
+Version: 3.13.2
+Date: 2024-09-24
 Authors@R: c(
     person("Jan Philipp", "Dietrich", , "dietrich@pik-potsdam.de", role = c("aut", "cre"),
            comment = c(affiliation = "Potsdam Institute for Climate Impact Research", ORCID = "0000-0002-4309-6431")),
diff --git a/R/fingerprint.R b/R/fingerprint.R
index 740e35d..d710436 100644
--- a/R/fingerprint.R
+++ b/R/fingerprint.R
@@ -144,7 +144,7 @@ fingerprintFiles <- function(paths) {
     hashCacheFile <- getHashCacheName(path)
     orgFiles <- files
 
-    if (!is.null(hashCacheFile) && file.exists(hashCacheFile)) {
+    if (!is.null(files) && !is.null(hashCacheFile) && file.exists(hashCacheFile)) {
       tryResult <- try({
         filesCache <- readRDS(hashCacheFile)
         # keep only entries which are still up-to-date
diff --git a/README.md b/README.md
index a9d6934..714d007 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # May All Data be Reproducible and Transparent (MADRaT) *
 
-R package **madrat**, version **3.13.1**
+R package **madrat**, version **3.13.2**
 
 [![CRAN status](https://www.r-pkg.org/badges/version/madrat)](https://cran.r-project.org/package=madrat) [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1115490.svg)](https://doi.org/10.5281/zenodo.1115490) [![R build status](https://github.com/pik-piam/madrat/workflows/check/badge.svg)](https://github.com/pik-piam/madrat/actions) [![codecov](https://codecov.io/gh/pik-piam/madrat/branch/master/graph/badge.svg)](https://app.codecov.io/gh/pik-piam/madrat) [![r-universe](https://pik-piam.r-universe.dev/badges/madrat)](https://pik-piam.r-universe.dev/builds)
 
@@ -55,7 +55,7 @@ In case of questions / problems please contact Jan Philipp Dietrich <dietrich@pi
 
 To cite package **madrat** in publications use:
 
-Dietrich J, Baumstark L, Wirth S, Giannousakis A, Rodrigues R, Bodirsky B, Leip D, Kreidenweis U, Klein D, Sauer P (2024). _madrat: May All Data be Reproducible and Transparent (MADRaT)_. doi:10.5281/zenodo.1115490 <https://doi.org/10.5281/zenodo.1115490>, R package version 3.13.1, <https://github.com/pik-piam/madrat>.
+Dietrich J, Baumstark L, Wirth S, Giannousakis A, Rodrigues R, Bodirsky B, Leip D, Kreidenweis U, Klein D, Sauer P (2024). _madrat: May All Data be Reproducible and Transparent (MADRaT)_. doi:10.5281/zenodo.1115490 <https://doi.org/10.5281/zenodo.1115490>, R package version 3.13.2, <https://github.com/pik-piam/madrat>.
 
 A BibTeX entry for LaTeX users is
 
@@ -64,7 +64,7 @@ A BibTeX entry for LaTeX users is
   title = {madrat: May All Data be Reproducible and Transparent (MADRaT)},
   author = {Jan Philipp Dietrich and Lavinia Baumstark and Stephen Wirth and Anastasis Giannousakis and Renato Rodrigues and Benjamin Leon Bodirsky and Debbora Leip and Ulrich Kreidenweis and David Klein and Pascal Sauer},
   year = {2024},
-  note = {R package version 3.13.1},
+  note = {R package version 3.13.2},
   url = {https://github.com/pik-piam/madrat},
   doi = {10.5281/zenodo.1115490},
 }