diff --git a/src/network/network_client.cpp b/src/network/network_client.cpp
index a990d75010..ce2d313cc0 100644
--- a/src/network/network_client.cpp
+++ b/src/network/network_client.cpp
@@ -646,7 +646,8 @@ bool ClientNetworkGameSocketHandler::IsConnected()
  *   DEF_CLIENT_RECEIVE_COMMAND has parameter: Packet *p
  ************/
 
-extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, struct LoadFilter *lf = nullptr);
+extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir,
+		struct LoadFilter *lf = nullptr, std::string *error_detail = nullptr);
 
 NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_FULL(Packet *p)
 {
@@ -941,14 +942,20 @@ NetworkRecvStatus ClientNetworkGameSocketHandler::Receive_SERVER_MAP_DONE(Packet
 
 	/* The map is done downloading, load it */
 	ClearErrorMessages();
-	bool load_success = SafeLoad({}, SLO_LOAD, DFT_GAME_FILE, GM_NORMAL, NO_DIRECTORY, lf);
+	std::string error_detail;
+	bool load_success = SafeLoad({}, SLO_LOAD, DFT_GAME_FILE, GM_NORMAL, NO_DIRECTORY, lf, &error_detail);
 
 	/* Long savegame loads shouldn't affect the lag calculation! */
 	this->last_packet = std::chrono::steady_clock::now();
 
 	if (!load_success) {
 		DeleteWindowById(WC_NETWORK_STATUS_WINDOW, WN_NETWORK_STATUS_WINDOW_JOIN);
-		ShowErrorMessage(STR_NETWORK_ERROR_SAVEGAMEERROR, INVALID_STRING_ID, WL_CRITICAL);
+		StringID detail = INVALID_STRING_ID;
+		if (!error_detail.empty()) {
+			detail = STR_JUST_RAW_STRING;
+			SetDParamStr(0, error_detail.c_str());
+		}
+		ShowErrorMessage(STR_NETWORK_ERROR_SAVEGAMEERROR, detail, WL_CRITICAL);
 		return NETWORK_RECV_STATUS_SAVEGAME;
 	}
 	/* If the savegame has successfully loaded, ALL windows have been removed,
diff --git a/src/openttd.cpp b/src/openttd.cpp
index b99ceb768b..d6e19379d0 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -1161,8 +1161,10 @@ static void MakeNewEditorWorld()
  * @param newgm switch to this mode of loading fails due to some unknown error
  * @param subdir default directory to look for filename, set to 0 if not needed
  * @param lf Load filter to use, if nullptr: use filename + subdir.
+ * @param error_detail Optional string to fill with detaied error information.
  */
-bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, struct LoadFilter *lf = nullptr)
+bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir,
+		struct LoadFilter *lf = nullptr, std::string *error_detail = nullptr)
 {
 	assert(fop == SLO_LOAD);
 	assert(dft == DFT_GAME_FILE || (lf == nullptr && dft == DFT_OLD_GAME_FILE));
@@ -1174,6 +1176,7 @@ bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileTy
 		case SL_OK: return true;
 
 		case SL_REINIT:
+			if (error_detail != nullptr) *error_detail = GetSaveLoadErrorString();
 			if (_network_dedicated) {
 				/*
 				 * We need to reinit a network map...
@@ -1198,6 +1201,7 @@ bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileTy
 			return false;
 
 		default:
+			if (error_detail != nullptr) *error_detail = GetSaveLoadErrorString();
 			_game_mode = ogm;
 			return false;
 	}
diff --git a/src/video/dedicated_v.cpp b/src/video/dedicated_v.cpp
index 445ff19e41..f91844bda1 100644
--- a/src/video/dedicated_v.cpp
+++ b/src/video/dedicated_v.cpp
@@ -129,7 +129,8 @@ static void *_dedicated_video_mem;
 /* Whether a fork has been done. */
 bool _dedicated_forks;
 
-extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, struct LoadFilter *lf = nullptr);
+extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir,
+		struct LoadFilter *lf = nullptr, std::string *error_detail = nullptr);
 
 static FVideoDriver_Dedicated iFVideoDriver_Dedicated;