diff --git a/DESCRIPTION b/DESCRIPTION
index 57a4e44aa..8c1e99ed5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: AMR
-Version: 3.0.1.9068
+Version: 3.0.1.9069
 Date: 2026-06-24
 Title: Antimicrobial Resistance Data Analysis
 Description: Functions to simplify and standardise antimicrobial resistance (AMR)
diff --git a/NEWS.md b/NEWS.md
index e789f2c3d..49acef57f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,4 +1,4 @@
-# AMR 3.0.1.9068
+# AMR 3.0.1.9069
 
 Planned as v3.1.0, end of June 2026.
 
diff --git a/R/sir.R b/R/sir.R
index a0fe78dac..11ee9e358 100755
--- a/R/sir.R
+++ b/R/sir.R
@@ -525,7 +525,7 @@ as.sir.default <- function(x,
   } else if (!all(is.na(x)) && !identical(levels(x), VALID_SIR_LEVELS) && !all(x %in% c(VALID_SIR_LEVELS, NA))) {
     if (all(x %unlike% "(S|I|R)", na.rm = TRUE) && !all(x %in% c(1, 2, 3, 4, 5), na.rm = TRUE)) {
       # check if they are actually MICs or disks
-      if (all_valid_mics(x) && !(all_valid_disks(x) && identical(x, floor(x)))) {
+      if (all_valid_mics(x) && !(all_valid_disks(x) && identical(x, tryCatch(floor(x), error = function(e) NULL)))) {
         warning_("in {.help [{.fun as.sir}](AMR::as.sir)}: input values were guessed to be MIC values - preferably transform them with {.help [{.fun as.mic}](AMR::as.mic)} before running {.help [{.fun as.sir}](AMR::as.sir)}.")
         return(as.sir(as.mic(x), ...))
       } else if (all_valid_disks(x)) {