diff --git a/btcjson/chainsvrresults.go b/btcjson/chainsvrresults.go
index 3ee2b8b6..5cd1e907 100644
--- a/btcjson/chainsvrresults.go
+++ b/btcjson/chainsvrresults.go
@@ -385,6 +385,9 @@ func (h *StringOrArray) UnmarshalJSON(data []byte) error {
 	}
 
 	switch v := unmarshalled.(type) {
+	case nil:
+		*h = nil
+
 	case string:
 		*h = []string{v}
 
diff --git a/btcjson/chainsvrresults_test.go b/btcjson/chainsvrresults_test.go
index fb681a9c..f37adb4b 100644
--- a/btcjson/chainsvrresults_test.go
+++ b/btcjson/chainsvrresults_test.go
@@ -350,6 +350,16 @@ func TestGetBlockChainInfoWarnings(t *testing.T) {
 			result:   `{"warnings": []}`,
 			expected: btcjson.StringOrArray{},
 		},
+		{
+			name:     "blockchain info with null warnings",
+			result:   `{"warnings": null}`,
+			expected: nil,
+		},
+		{
+			name:     "blockchain info with warnings field omitted",
+			result:   `{}`,
+			expected: nil,
+		},
 	}
 
 	for _, test := range tests {