diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0cf84c8f922..3d7c8bef61d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -121,6 +121,7 @@
 * [BUGFIX] Experimental TSDB: when the querier receives a `/series` request with a time range older than the data stored in the ingester, it now ignores the requested time range and returns known series anyway instead of returning an empty response. This aligns the behaviour with the chunks storage. #2617
 * [BUGFIX] Cassandra: fixed an edge case leading to an invalid CQL query when querying the index on a Cassandra store. #2639
 * [BUGFIX] Ingester: increment series per metric when recovering from WAL or transfer. #2674
+* [BUGFIX] Fixed `wrong number of arguments for 'mget' command` Redis error when a query has no chunks to lookup from storage. #2700
 
 ## 1.1.0 / 2020-05-21
 
diff --git a/pkg/chunk/chunk_store.go b/pkg/chunk/chunk_store.go
index aa556b5d077..bd69eedeea3 100644
--- a/pkg/chunk/chunk_store.go
+++ b/pkg/chunk/chunk_store.go
@@ -505,6 +505,11 @@ func (c *baseStore) lookupEntriesByQueries(ctx context.Context, queries []IndexQ
 	log, ctx := spanlogger.New(ctx, "store.lookupEntriesByQueries")
 	defer log.Span.Finish()
 
+	// Nothing to do if there are no queries.
+	if len(queries) == 0 {
+		return nil, nil
+	}
+
 	var lock sync.Mutex
 	var entries []IndexEntry
 	err := c.index.QueryPages(ctx, queries, func(query IndexQuery, resp ReadBatch) bool {
@@ -527,7 +532,12 @@ func (c *baseStore) lookupEntriesByQueries(ctx context.Context, queries []IndexQ
 	return entries, err
 }
 
-func (c *baseStore) parseIndexEntries(ctx context.Context, entries []IndexEntry, matcher *labels.Matcher) ([]string, error) {
+func (c *baseStore) parseIndexEntries(_ context.Context, entries []IndexEntry, matcher *labels.Matcher) ([]string, error) {
+	// Nothing to do if there are no entries.
+	if len(entries) == 0 {
+		return nil, nil
+	}
+
 	result := make([]string, 0, len(entries))
 	for _, entry := range entries {
 		chunkKey, labelValue, _, err := parseChunkTimeRangeValue(entry.RangeValue, entry.Value)
diff --git a/pkg/chunk/composite_store.go b/pkg/chunk/composite_store.go
index 659ef65edf6..46e055fcb13 100644
--- a/pkg/chunk/composite_store.go
+++ b/pkg/chunk/composite_store.go
@@ -162,6 +162,11 @@ func (c compositeStore) GetChunkRefs(ctx context.Context, userID string, from, t
 			return err
 		}
 
+		// Skip it if there are no chunks.
+		if len(ids) == 0 {
+			return nil
+		}
+
 		chunkIDs = append(chunkIDs, ids...)
 		fetchers = append(fetchers, fetcher...)
 		return nil
diff --git a/pkg/chunk/series_store.go b/pkg/chunk/series_store.go
index 74f3f67b57f..4928ca9b964 100644
--- a/pkg/chunk/series_store.go
+++ b/pkg/chunk/series_store.go
@@ -182,6 +182,11 @@ func (c *seriesStore) GetChunkRefs(ctx context.Context, userID string, from, thr
 	level.Debug(log).Log("chunks-post-filtering", len(chunks))
 	chunksPerQuery.Observe(float64(len(chunks)))
 
+	// We should return an empty chunks slice if there are no chunks.
+	if len(chunks) == 0 {
+		return [][]Chunk{}, []*Fetcher{}, nil
+	}
+
 	return [][]Chunk{chunks}, []*Fetcher{c.baseStore.Fetcher}, nil
 }