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-rw-r--r--libnetdata/eval/eval.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libnetdata/eval/eval.c b/libnetdata/eval/eval.c
index 0316edac..f8af801f 100644
--- a/libnetdata/eval/eval.c
+++ b/libnetdata/eval/eval.c
@@ -176,7 +176,7 @@ static inline calculated_number eval_variable(EVAL_EXPRESSION *exp, EVAL_VARIABL
*error = EVAL_ERROR_UNKNOWN_VARIABLE;
buffer_sprintf(exp->error_msg, "[ undefined variable '%s' ] ", v->name);
- return 0;
+ return NAN;
}
static inline calculated_number eval_value(EVAL_EXPRESSION *exp, EVAL_VALUE *v, int *error) {