diff --git a/docs/victorialogs/CHANGELOG.md b/docs/victorialogs/CHANGELOG.md
index aad272b68d..d2567c3ed2 100644
--- a/docs/victorialogs/CHANGELOG.md
+++ b/docs/victorialogs/CHANGELOG.md
@@ -24,6 +24,7 @@ according to the following docs:
 
 * FEATURE: [querying API](https://docs.victoriametrics.com/victorialogs/querying/): allow using [`limit`](https://docs.victoriametrics.com/victorialogs/logsql/#limit-pipe) and [`offset`](https://docs.victoriametrics.com/victorialogs/logsql/#offset-pipe) pipes after the [`stats` pipe](https://docs.victoriametrics.com/victorialogs/logsql/#stats-pipe) in queries to [`/select/logsql/stats_query`](https://docs.victoriametrics.com/victorialogs/querying/#querying-log-stats). This enables the usage for these pipes in [alerting and recording rules for VictoriaLogs](https://docs.victoriametrics.com/victorialogs/vmalert/). See [#1296](https://github.com/VictoriaMetrics/VictoriaLogs/issues/1296).
 * FEATURE: [alerts](https://github.com/VictoriaMetrics/VictoriaLogs/blob/master/deployment/docker/rules): add new alerting rules `PersistentQueueRunsOutOfSpaceIn12Hours` and `PersistentQueueRunsOutOfSpaceIn4Hours` for `vlagent` persistent queue capacity. These alerts help users to take proactive actions before `vlagent` starts dropping logs due to insufficient persistent queue space. See [#10193](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10193)
+* FEATURE: [LogsQL](https://docs.victoriametrics.com/victorialogs/logsql/): return a parse error on whitespace between a filter function name and the opening parenthesis, such as `ip:ipv4_range (1.2.3.4, 5.6.7.8)`. Previously such queries were accepted. See [#1385](https://github.com/VictoriaMetrics/VictoriaLogs/issues/1385).
 * FEATURE: [web UI](https://docs.victoriametrics.com/victorialogs/querying/#web-ui): remove the `Date format` setting and always display timestamps with nanosecond precision. See [#1161](https://github.com/VictoriaMetrics/VictoriaLogs/issues/1161).
 * FEATURE: [web UI](https://docs.victoriametrics.com/victorialogs/querying/#web-ui): rename field `Query time` to `Hits query` on the Hits chart panel. The change makes it clear duration of which query is displayed.
 
diff --git a/lib/logstorage/parser.go b/lib/logstorage/parser.go
index 3c6204395d..843c4b2c85 100644
--- a/lib/logstorage/parser.go
+++ b/lib/logstorage/parser.go
@@ -2333,6 +2333,9 @@ func parseFuncArgMaybePrefix(lex *lexer, fieldName string, callback func(arg str
 		lex.restoreState(lexState)
 		return parseFilterPhrase(lex, fieldName)
 	}
+	if lex.isSkippedSpace {
+		return nil, fmt.Errorf("unexpected whitespace between %q and '('", funcName)
+	}
 	lex.nextToken()
 
 	arg := ""
@@ -2873,6 +2876,9 @@ func parseFilterRange(lex *lexer, fieldName string) (filter, error) {
 		lex.restoreState(lexState)
 		return parseFilterPhrase(lex, fieldName)
 	}
+	if lex.isSkippedSpace {
+		return nil, fmt.Errorf("unexpected whitespace between %q and %q", funcName, lex.token)
+	}
 	lex.nextToken()
 
 	minValue, minValueStr, err := parseNumber(lex)
@@ -2953,6 +2959,9 @@ func parseFuncArgs(lex *lexer, fieldName string, callback func(funcName string,
 		lex.restoreState(lexState)
 		return parseFilterPhrase(lex, fieldName)
 	}
+	if lex.isSkippedSpace {
+		return nil, fmt.Errorf("unexpected whitespace between %q and '('", funcName)
+	}
 
 	args, err := parseArgsInParens(lex)
 	if err != nil {
@@ -2969,6 +2978,9 @@ func parseFuncArgsPossibleWildcard(lex *lexer, callback func(args []string) (fil
 	if !lex.isKeyword("(") {
 		return nil, fmt.Errorf("the %q must be put in quotes", funcName)
 	}
+	if lex.isSkippedSpace {
+		return nil, fmt.Errorf("unexpected whitespace between %q and '('", funcName)
+	}
 
 	args, isWildcard, err := parseArgsInParensPossibleWildcard(lex)
 	if err != nil {
diff --git a/lib/logstorage/parser_test.go b/lib/logstorage/parser_test.go
index 67fae3e4cf..3d20717d8f 100644
--- a/lib/logstorage/parser_test.go
+++ b/lib/logstorage/parser_test.go
@@ -2696,6 +2696,7 @@ func TestParseQuery_Failure(t *testing.T) {
 
 	// invalid i
 	f(`i(`)
+	f(`i (foo)`)
 	f(`i(aa`)
 	f(`i(aa, bb)`)
 	f(`i(*`)
@@ -2729,6 +2730,7 @@ func TestParseQuery_Failure(t *testing.T) {
 	// invalid contains_any
 	f(`contains_any`)
 	f(`a:contains_any`)
+	f(`contains_any (foo)`)
 	f(`contains_any(`)
 	f(`contains_any(,)`)
 	f(`contains_any(f, b c)`)
@@ -2763,6 +2765,8 @@ func TestParseQuery_Failure(t *testing.T) {
 	f(`contains_all(x | fields a,b)`)
 
 	// invalid ipv4_range
+	f(`ipv4_range (1.2.3.4, 5.6.7.8)`)
+	f(`ip:ipv4_range (1.2.3.4, 5.6.7.8)`)
 	f(`ipv4_range(`)
 	f(`ipv4_range(foo,bar)`)
 	f(`ipv4_range(1.2.3.4*)`)
@@ -2800,6 +2804,8 @@ func TestParseQuery_Failure(t *testing.T) {
 	f(`pattern_match_suffix(`)
 
 	// invalid range
+	f(`range (1,2)`)
+	f(`foo:range (1,2)`)
 	f(`range(`)
 	f(`range(foo,bar)`)
 	f(`range(1"`)