diff --git a/src/main/java/it/tdlight/tdlibsession/td/ResponseError.java b/src/main/java/it/tdlight/tdlibsession/td/ResponseError.java
index e82cd23..a979f09 100644
--- a/src/main/java/it/tdlight/tdlibsession/td/ResponseError.java
+++ b/src/main/java/it/tdlight/tdlibsession/td/ResponseError.java
@@ -17,59 +17,69 @@ public class ResponseError extends IOException {
 	private final int code;
 	@NotNull
 	private final String message;
-	private final Throwable cause;
 
-	public ResponseError(@NotNull Function function, @NotNull String botName, @NotNull TdApi.Error cause) {
-		super("Bot '" + botName + "' failed the request '" + functionToInlineString(function) + "': " + cause.code + " " + cause.message);
+	private ResponseError(@NotNull Function function, @NotNull String botName, @NotNull TdApi.Error tdError, @Nullable Throwable cause) {
+		super("Bot '" + botName + "' failed the request '" + functionToInlineString(function) + "': " + tdError.code + " " + tdError.message, cause);
 		this.botName = botName;
 		this.tag = functionToInlineString(function);
-		this.code = cause.code;
-		this.message = cause.message;
-		this.cause = null;
+		this.code = tdError.code;
+		this.message = tdError.message;
 	}
 
-	public ResponseError(@NotNull String tag, @NotNull String botName, @NotNull TdApi.Error cause) {
-		super("Bot '" + botName + "' failed the request '" + tag + "': " + cause.code + " " + cause.message);
+	private ResponseError(@NotNull String tag, @NotNull String botName, @NotNull TdApi.Error tdError, @Nullable Throwable cause) {
+		super("Bot '" + botName + "' failed the request '" + tag + "': " + tdError.code + " " + tdError.message, cause);
 		this.botName = botName;
 		this.tag = tag;
-		this.code = cause.code;
-		this.message = cause.message;
-		this.cause = null;
+		this.code = tdError.code;
+		this.message = tdError.message;
 	}
 
-	public ResponseError(@NotNull Function function, @NotNull String botName, @NotNull Throwable cause) {
-		super("Bot '" + botName + "' failed the request '" + functionToInlineString(function) + "': " + cause.getMessage());
+	private ResponseError(@NotNull Function function, @NotNull String botName, @Nullable Throwable cause) {
+		super("Bot '" + botName + "' failed the request '" + functionToInlineString(function) + "': " + (cause == null ? null : cause.getMessage()), cause);
 		this.botName = botName;
 		this.tag = functionToInlineString(function);
 		this.code = 500;
-		this.message = cause.getMessage();
-		this.cause = cause;
-		this.initCause(cause);
+		this.message = (cause == null ? "" : (cause.getMessage() == null ? "" : cause.getMessage()));
 	}
 
-	public ResponseError(@NotNull String tag, @NotNull String botName, @NotNull Throwable cause) {
-		super("Bot '" + botName + "' failed the request '" + tag + "': " + cause.getMessage());
+	private ResponseError(@NotNull String tag, @NotNull String botName, @Nullable Throwable cause) {
+		super("Bot '" + botName + "' failed the request '" + tag + "': " + (cause == null ? null : cause.getMessage()), cause);
 		this.botName = botName;
 		this.tag = tag;
 		this.code = 500;
-		this.message = cause.getMessage();
-		this.cause = cause;
-		this.initCause(cause);
+		this.message = (cause == null ? "" : (cause.getMessage() == null ? "" : cause.getMessage()));
 	}
 
-	public static ResponseError newResponseError(@NotNull Function function, @NotNull String botName, @NotNull TdApi.Error cause) {
+	public static ResponseError newResponseError(@NotNull Function function,
+			@NotNull String botName,
+			@NotNull TdApi.Error tdError,
+			@Nullable Throwable cause) {
+		return new ResponseError(function, botName, tdError, cause);
+	}
+
+	public static ResponseError newResponseError(@NotNull String tag,
+			@NotNull String botName,
+			@NotNull TdApi.Error tdError,
+			@Nullable Throwable cause) {
+		return new ResponseError(tag, botName, tdError, cause);
+	}
+
+	public static ResponseError newResponseError(@NotNull String tag,
+			@NotNull String botName,
+			@NotNull TdApi.Error tdError,
+			@Nullable TdError cause) {
+		return new ResponseError(tag, botName, tdError, cause);
+	}
+
+	public static ResponseError newResponseError(@NotNull Function function,
+			@NotNull String botName,
+			@Nullable Throwable cause) {
 		return new ResponseError(function, botName, cause);
 	}
 
-	public static ResponseError newResponseError(@NotNull String tag, @NotNull String botName, @NotNull TdApi.Error cause) {
-		return new ResponseError(tag, botName, cause);
-	}
-
-	public static ResponseError newResponseError(@NotNull Function function, @NotNull String botName, @NotNull Throwable cause) {
-		return new ResponseError(function, botName, cause);
-	}
-
-	public static ResponseError newResponseError(@NotNull String tag, @NotNull String botName, @NotNull Throwable cause) {
+	public static ResponseError newResponseError(@NotNull String tag,
+			@NotNull String botName,
+			@Nullable Throwable cause) {
 		return new ResponseError(tag, botName, cause);
 	}