diff --git a/ADIS_tinyK22_SplitFlap/source/shell.c b/ADIS_tinyK22_SplitFlap/source/shell.c
index f52925b..420d97f 100644
--- a/ADIS_tinyK22_SplitFlap/source/shell.c
+++ b/ADIS_tinyK22_SplitFlap/source/shell.c
@@ -155,6 +155,10 @@ uint8_t SHELL_Int32ArrayToStringForSF(int32_t* intArray, int8_t size, char *str)
 			return ERR_RANGE;
 		}
 		*str = (char)intArray[i];
+		// array ended early => return ok
+		if(*str == '\0'){
+			return ERR_OK;
+		}
 		if(!((*str <= '9' && *str >= '0') || (*str >= 'A' && *str <= 'Z') ||
 				*str == '!' || *str == '?' || *str == ':' || *str == ' ')){
 			return ERR_RANGE;