diff --git a/bubulles.c b/bubulles.c
index de708bf..0a6885d 100644
--- a/bubulles.c
+++ b/bubulles.c
@@ -139,7 +139,7 @@ fprintf(stderr, "%s : %p --> %p\n", __func__, what, where);
 fprintf(stderr, "XYZ %f %f %f\n", what->p.x, what->p.y, what->p.z);
 #endif
 
-if (where->fidx > where->size) {
+if (where->fidx >= where->size) {
 	/* this is a very bad fatal error */
 	fprintf(stderr, "%s : overflow in BBList at %p\n", __func__, where);
 #if MUST_ABORT
diff --git a/bubulles.h b/bubulles.h
index feff58f..d647561 100644
--- a/bubulles.h
+++ b/bubulles.h
@@ -4,7 +4,7 @@
 
 /* --------------------------------------------------------------------- */
 
-#define LIBBB_VERSION		53
+#define LIBBB_VERSION		54
 
 #define SZ_BUBULLE_TEXT		51		/* arbitrary value */