diff --git a/internal/gitaly/hook/postreceive.go b/internal/gitaly/hook/postreceive.go
index 2063b1adf992392541c0fa55ac5b1e379bc48db3..36faa08d13f2ccfd3752436ae03f98188f5fa54f 100644
--- a/internal/gitaly/hook/postreceive.go
+++ b/internal/gitaly/hook/postreceive.go
@@ -34,6 +34,9 @@ const (
 func getEnvVar(key string, vars []string) string {
 	for _, varPair := range vars {
 		kv := strings.SplitN(varPair, "=", 2)
+		if len(kv) < 2 {
+			continue
+		}
 		if kv[0] == key {
 			return kv[1]
 		}
diff --git a/internal/gitaly/hook/postreceive_test.go b/internal/gitaly/hook/postreceive_test.go
index 5fb125ad044013482c26889b9648595a06914136..e9abedb5385d44ea64c30835d1e610d878993d60 100644
--- a/internal/gitaly/hook/postreceive_test.go
+++ b/internal/gitaly/hook/postreceive_test.go
@@ -410,3 +410,57 @@ func TestPostReceive_quarantine(t *testing.T) {
 		})
 	}
 }
+
+func Test_getEnvVar(t *testing.T) {
+	type args struct {
+		key  string
+		vars []string
+	}
+	tests := []struct {
+		desc string
+		args args
+		want string
+	}{
+		{
+			desc: "success found key from key-value pairs",
+			args: args{
+				key: "key",
+				vars: []string{
+					"key1=value1",
+					"key=value",
+					"key2=value2",
+				},
+			},
+			want: "value",
+		},
+		{
+			desc: "invalid key-value format, only key name",
+			args: args{
+				key: "key",
+				vars: []string{
+					"key",
+					"key=value",
+					"key2=value2",
+				},
+			},
+			want: "value",
+		},
+		{
+			desc: "key not found",
+			args: args{
+				key: "key",
+				vars: []string{
+					"key",
+					"key1=value1",
+					"key2=value2",
+				},
+			},
+			want: "",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.desc, func(t *testing.T) {
+			assert.Equalf(t, tt.want, getEnvVar(tt.args.key, tt.args.vars), "getEnvVar(%v, %v)", tt.args.key, tt.args.vars)
+		})
+	}
+}