diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 4f2024c48..49861d3f9 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -46,6 +46,7 @@ The following `tip` changes can be tested by building VictoriaMetrics components
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): properly validate scheme for `proxy_url` field at the scrape config. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4811) for details.
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): properly apply `if` filters during [relabeling](https://docs.victoriametrics.com/vmagent.html#relabeling-enhancements). Previously the `if` filter could improperly work. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4806) and [this pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4816).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): use local scrape timestamps for the scraped metrics unless `honor_timestamps: true` option is explicitly set at [scrape_config](https://docs.victoriametrics.com/sd_configs.html#scrape_configs). This fixes gaps for metrics collected from [cadvisor](https://github.com/google/cadvisor) or similar exporters, which export metrics with invalid timestamps. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4697) and [this comment](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4697#issuecomment-1654614799) for details. The issue has been introduced in [v1.68.0](#v1680).
+* BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): fixes runtime panic at OpenTelemetry parser. Opentelemetry format allows histograms without `sum` fields. Such histogram converted as counter with `_count` suffix. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4814).
 * BUGFIX: [vmagent](https://docs.victoriametrics.com/vmagent.html): keep unmatched series at [stream aggregation](https://docs.victoriametrics.com/stream-aggregation.html) when `-remoteWrite.streamAggr.dropInput` is set to `false` to match intended behaviour introduced at [v1.92.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.92.0). See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4804).
 * BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert.html): properly set `vmalert_config_last_reload_successful` value on configuration updates or rollbacks. The bug was introduced in [v1.92.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.92.0) in [this PR](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4543).
 * BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert.html): fix `vmalert_remotewrite_send_duration_seconds_total` value, before it didn't count in the real time spending on remote write requests. See [this pr](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/4801) for details.
diff --git a/lib/protoparser/opentelemetry/stream/streamparser.go b/lib/protoparser/opentelemetry/stream/streamparser.go
index f5b79d5d8..882451fdc 100644
--- a/lib/protoparser/opentelemetry/stream/streamparser.go
+++ b/lib/protoparser/opentelemetry/stream/streamparser.go
@@ -133,9 +133,16 @@ func (wr *writeContext) appendSamplesFromHistogram(metricName string, p *pb.Hist
 	t := int64(p.TimeUnixNano / 1e6)
 	isStale := (p.Flags)&uint32(1) != 0
 	wr.pointLabels = appendAttributesToPromLabels(wr.pointLabels[:0], p.Attributes)
+	wr.appendSample(metricName+"_count", t, float64(p.Count), isStale)
+	if p.Sum == nil {
+		// fast path, convert metric as simple counter.
+		// given buckets cannot be used for histogram functions.
+		// Negative threshold buckets MAY be used, but then the Histogram MetricPoint MUST NOT contain a sum value as it would no longer be a counter semantically.
+		// https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#histogram
+		return
+	}
 
 	wr.appendSample(metricName+"_sum", t, *p.Sum, isStale)
-	wr.appendSample(metricName+"_count", t, float64(p.Count), isStale)
 
 	var cumulative uint64
 	for index, bound := range p.ExplicitBounds {