diff --git a/DESCRIPTION b/DESCRIPTION
index dc342b3..b9d74a6 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: BMA
-Version: 3.18.19
-Date: 2024-10-17
+Version: 3.18.20
+Date: 2025-01-10
 Title: Bayesian Model Averaging
 Authors@R: c(person(given = "Adrian",
                       family = "Raftery",
diff --git a/R/iBMA.glm.R b/R/iBMA.glm.R
index d07db94..32508b0 100755
--- a/R/iBMA.glm.R
+++ b/R/iBMA.glm.R
@@ -26,9 +26,9 @@ https://github.com/SurajGupta/r-source/blob/master/src/main/envir.c
  
 src <- '
 if (TYPEOF(env) == NILSXP)
-error("use of NULL environment is defunct");
+perror("use of NULL environment is defunct");
 if (TYPEOF(env) != ENVSXP)
-error("not an environment");
+perror("not an environment");
  
 UNLOCK_FRAME(env);
  
diff --git a/R/iBMA.surv.R b/R/iBMA.surv.R
index 13f9b54..abc7813 100755
--- a/R/iBMA.surv.R
+++ b/R/iBMA.surv.R
@@ -27,9 +27,9 @@ https://github.com/SurajGupta/r-source/blob/master/src/main/envir.c
  
 src <- '
 if (TYPEOF(env) == NILSXP)
-error("use of NULL environment is defunct");
+perror("use of NULL environment is defunct");
 if (TYPEOF(env) != ENVSXP)
-error("not an environment");
+perror("not an environment");
  
 UNLOCK_FRAME(env);