diff --git a/server/src/utils/queries/charts.ts b/server/src/utils/queries/charts.ts
index e2305b893..00b79e3ea 100644
--- a/server/src/utils/queries/charts.ts
+++ b/server/src/utils/queries/charts.ts
@@ -87,8 +87,10 @@ export function FindChartOnInGameID(
     playtype: Playtypes[Game],
     difficulty: Difficulties[IDStrings]
 ) {
-    // @todo #101 throw an error if this is called with a game that doesn't
-    // support InGameID.
+    if (game === "bms" || game === "usc") {
+        throw new Error(`Cannot call FindChartOnInGameID for game ${game}.`);
+    }
+
     return db.charts[game].findOne({
         "data.inGameID": inGameID,
         playtype,
@@ -124,8 +126,6 @@ export function FindIIDXChartOnInGameIDVersion(
     difficulty: Difficulties[IDStrings],
     version: string
 ) {
-    // @todo #101 throw an error if this is called with a game that doesn't
-    // support InGameID.
     return db.charts.iidx.findOne({
         "data.inGameID": inGameID,
         "flags.2dxtra": false,
@@ -170,7 +170,7 @@ export function FindIIDXChartWith2DXtraHash(hash: string) {
  */
 export function FindSDVXChartOnInGameID(
     inGameID: number,
-    difficulty: "NOV" | "ADV" | "EXH" | "MXM" | "ANY_INF"
+    difficulty: Difficulties["sdvx:Single"] | "ANY_INF"
 ) {
     const diffQuery =
         difficulty === "ANY_INF"