diff --git a/backend/src/api.js b/backend/src/api.js
index 328e0ac..215ab04 100644
--- a/backend/src/api.js
+++ b/backend/src/api.js
@@ -4,9 +4,10 @@ import Joi from 'joi';
 import j2s from "joi-to-swagger";
 
 export class ApiError extends Error {
-    constructor(status, message) {
+    constructor(status, message, cause) {
         super(message);
         this.status = status;
+        this.cause = cause;
     }
 }
 
@@ -234,9 +235,9 @@ router.post("/games", asyncHandler(async (req, res) => {
 
         await conn.commit();
         res.status(201).json({ game: gameRow[0], players });
-    } catch (_err) {
+    } catch (err) {
         await conn.rollback();
-        throw new ApiError(500, "Failed to create game");
+        throw new ApiError(500, "Failed to create game", err);
     } finally {
         conn.release();
     }
@@ -299,9 +300,9 @@ router.post("/games/:id/players", asyncHandler(async (req, res) => {
 
         await conn.commit();
         res.status(201).json({ game: gameId, players });
-    } catch (_err) {
+    } catch (err) {
         await conn.rollback();
-        throw new ApiError(500, "Failed to add player");
+        throw new ApiError(500, "Failed to add player", err);
     } finally {
         conn.release();
     }
@@ -372,9 +373,9 @@ router.patch("/games/:id/lock", asyncHandler(async (req, res) => {
 
         await conn.commit();
         res.json({ message: "Game locked", turnOrder });
-    } catch (_err) {
+    } catch (err) {
         await conn.rollback();
-        throw new ApiError(500, "Failed to lock game");
+        throw new ApiError(500, "Failed to lock game", err);
     } finally {
         conn.release();
     }
@@ -484,9 +485,9 @@ router.post("/games/:id/turns", asyncHandler(async (req, res) => {
 
         await conn.commit();
         res.status(201).json({ turnId: result.insertId, nextPlayer });
-    } catch (_err) {
+    } catch (err) {
         await conn.rollback();
-        throw new ApiError(500, "Failed to record turn");
+        throw new ApiError(500, "Failed to record turn", err);
     } finally {
         conn.release();
     }
diff --git a/backend/src/index.js b/backend/src/index.js
index d0b9621..dbc80a7 100644
--- a/backend/src/index.js
+++ b/backend/src/index.js
@@ -48,11 +48,14 @@ app.use("/api/docs", swaggerUi.serve, swaggerUi.setup(specs));
 app.use("/api", apiRouter);
 
 app.use((err, req, res, next) => {
-  console.error(err);
   if (err instanceof ApiError) {
+    if (err.cause != null) {
+      console.error(err.cause);
+    }
     return res.status(err.status).json({ status: "error", error: err.message });
   }
 
+  console.error(err);
   res.status(500).json({ status: "error", error: "Internal server error" });
 });