diff --git a/qpms/qpms_types.h b/qpms/qpms_types.h
index 4c1585f..f15d71c 100644
--- a/qpms/qpms_types.h
+++ b/qpms/qpms_types.h
@@ -79,7 +79,9 @@ typedef unsigned long long qpms_uvswfi_t;
 typedef enum {
 	QPMS_SUCCESS = 0, ///< Success.
 	QPMS_ERROR = 1, ///< Unspecified error.
-	QPMS_ENOMEM = 8 ///< Out of memory.
+	QPMS_ENOMEM = 8, ///< Out of memory.
+	QPMS_NAN_ENCOUNTERED = 1024 ///< NaN value encountered in data processing.
+
 } qpms_errno_t;
 
 
diff --git a/qpms/tmatrices.c b/qpms/tmatrices.c
index 9ee21f1..baf6ae4 100644
--- a/qpms/tmatrices.c
+++ b/qpms/tmatrices.c
@@ -454,6 +454,14 @@ qpms_errno_t qpms_load_scuff_tmatrix(
         "Could not open T-matrix file %s", path); 
   qpms_errno_t retval = 
     qpms_read_scuff_tmatrix(f, bs, n, freqs, freqs_su, tmatrices_array, tmdata);
+
+  for (size_t i = 0; i < *n * bs->n * bs->n; ++i) 
+    if(isnan(creal((*tmdata)[i])) || isnan(cimag((*tmdata)[i]))) {
+      QPMS_WARN("Encountered NAN in a loaded T-matrix");
+      retval |= QPMS_NAN_ENCOUNTERED;
+      break;
+    }
+
   if(fclose(f)) qpms_pr_error_at_line(__FILE__, __LINE__, __func__,
         "Could not close the T-matrix file %s (well, that's weird, "
         "since it's read only).", path);