diff --git a/.buildlibrary b/.buildlibrary
index 7b710b7..15ef26d 100644
--- a/.buildlibrary
+++ b/.buildlibrary
@@ -1,4 +1,4 @@
-ValidationKey: '42068600'
+ValidationKey: '42088500'
 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 c1496cd..7d43645 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,7 +2,7 @@ cff-version: 1.2.0
 message: If you use this software, please cite it using the metadata from this file.
 type: software
 title: 'modelstats: Run Analysis Tools'
-version: 0.21.14
+version: 0.21.15
 date-released: '2024-06-26'
 abstract: A collection of tools to analyze model runs.
 authors:
diff --git a/DESCRIPTION b/DESCRIPTION
index d3163be..b6594b2 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: modelstats
 Type: Package
 Title: Run Analysis Tools
-Version: 0.21.14
+Version: 0.21.15
 Date: 2024-06-26
 Authors@R: c(
     person("Anastasis", "Giannousakis", email = "giannou@pik-potsdam.de", role = c("aut","cre")),
diff --git a/R/modeltests.R b/R/modeltests.R
index bd4cc4a..5c34259 100644
--- a/R/modeltests.R
+++ b/R/modeltests.R
@@ -322,7 +322,7 @@ evaluateRuns <- function(model, mydir, gitPath, compScen, email, mattermostToken
           lastRun <- max(sameRuns[sameRuns < basename(cfg$results_folder)])
           currentRunTime <- as.numeric(.readRuntime("."),                    units = "hours")
           lastRunTime    <- as.numeric(.readRuntime(paste0("../", lastRun)), units = "hours")
-          if (currentRunTime > (1.25 * lastRunTime)) {
+          if (length(currentRunTime) > 0 && length(lastRunTime) > 0 && currentRunTime > (1.25 * lastRunTime)) {
             errorList <- c(errorList, "Check runtime! Have some scenarios become slower?")
           }
         }
diff --git a/README.md b/README.md
index c1dfa9d..c4b610e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Run Analysis Tools
 
-R package **modelstats**, version **0.21.14**
+R package **modelstats**, version **0.21.15**
 
 [![CRAN status](https://www.r-pkg.org/badges/version/modelstats)](https://cran.r-project.org/package=modelstats)  [![R build status](https://github.com/pik-piam/modelstats/workflows/check/badge.svg)](https://github.com/pik-piam/modelstats/actions) [![codecov](https://codecov.io/gh/pik-piam/modelstats/branch/master/graph/badge.svg)](https://app.codecov.io/gh/pik-piam/modelstats) [![r-universe](https://pik-piam.r-universe.dev/badges/modelstats)](https://pik-piam.r-universe.dev/builds)
 
@@ -47,7 +47,7 @@ In case of questions / problems please contact Anastasis Giannousakis <giannou@p
 
 To cite package **modelstats** in publications use:
 
-Giannousakis A, Richters O (2024). _modelstats: Run Analysis Tools_. R package version 0.21.14, <URL: https://github.com/pik-piam/modelstats>.
+Giannousakis A, Richters O (2024). _modelstats: Run Analysis Tools_. R package version 0.21.15, <https://github.com/pik-piam/modelstats>.
 
 A BibTeX entry for LaTeX users is
 
@@ -56,7 +56,7 @@ A BibTeX entry for LaTeX users is
   title = {modelstats: Run Analysis Tools},
   author = {Anastasis Giannousakis and Oliver Richters},
   year = {2024},
-  note = {R package version 0.21.14},
+  note = {R package version 0.21.15},
   url = {https://github.com/pik-piam/modelstats},
 }
 ```