diff --git a/changelog/unreleased/issue-18017.toml b/changelog/unreleased/issue-18017.toml
new file mode 100644
index 000000000000..10c3e4c65839
--- /dev/null
+++ b/changelog/unreleased/issue-18017.toml
@@ -0,0 +1,5 @@
+type = "f"
+message = "Reverts fix for #16029 due to regression in GeoIP lookup table access."
+
+issues = ["18017"]
+pulls = ["18322"]
diff --git a/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/PipelineRuleParser.java b/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/PipelineRuleParser.java
index d8340d7d7642..7b3c6d0c92d6 100644
--- a/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/PipelineRuleParser.java
+++ b/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/PipelineRuleParser.java
@@ -22,6 +22,7 @@
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.swrve.ratelimitedlogger.RateLimitedLog;
+import jakarta.inject.Inject;
 import org.antlr.v4.runtime.ANTLRInputStream;
 import org.antlr.v4.runtime.BaseErrorListener;
 import org.antlr.v4.runtime.CommonTokenStream;
@@ -73,7 +74,6 @@
 import org.graylog.plugins.pipelineprocessor.parser.errors.IncompatibleIndexType;
 import org.graylog.plugins.pipelineprocessor.parser.errors.IncompatibleType;
 import org.graylog.plugins.pipelineprocessor.parser.errors.IncompatibleTypes;
-import org.graylog.plugins.pipelineprocessor.parser.errors.InvalidFieldAccess;
 import org.graylog.plugins.pipelineprocessor.parser.errors.InvalidFunctionArgument;
 import org.graylog.plugins.pipelineprocessor.parser.errors.InvalidOperation;
 import org.graylog.plugins.pipelineprocessor.parser.errors.MissingRequiredParam;
@@ -89,8 +89,6 @@
 import org.joda.time.Duration;
 import org.joda.time.Period;
 
-import jakarta.inject.Inject;
-
 import java.util.ArrayDeque;
 import java.util.HashMap;
 import java.util.IdentityHashMap;
@@ -436,9 +434,6 @@ public void exitNested(RuleLangParser.NestedContext ctx) {
             isIdIsFieldAccess.pop(); // reset for error checks
             final Expression object = exprs.get(ctx.fieldSet);
             final Expression field = exprs.get(ctx.field);
-            if (field instanceof ArrayLiteralExpression) {
-                parseContext.addError(new InvalidFieldAccess(ctx, field));
-            }
             final FieldAccessExpression expr = new FieldAccessExpression(ctx.getStart(), object, field);
             log.trace("FIELDACCESS: ctx {} => {}", ctx, expr);
             exprs.put(ctx, expr);
diff --git a/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/errors/InvalidFieldAccess.java b/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/errors/InvalidFieldAccess.java
deleted file mode 100644
index 5b927d2905b3..000000000000
--- a/graylog2-server/src/main/java/org/graylog/plugins/pipelineprocessor/parser/errors/InvalidFieldAccess.java
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright (C) 2020 Graylog, Inc.
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the Server Side Public License, version 1,
- * as published by MongoDB, Inc.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * Server Side Public License for more details.
- *
- * You should have received a copy of the Server Side Public License
- * along with this program. If not, see
- * <http://www.mongodb.com/licensing/server-side-public-license>.
- */
-package org.graylog.plugins.pipelineprocessor.parser.errors;
-
-import com.fasterxml.jackson.annotation.JsonProperty;
-import org.graylog.plugins.pipelineprocessor.ast.expressions.Expression;
-import org.graylog.plugins.pipelineprocessor.parser.RuleLangParser;
-
-public class InvalidFieldAccess extends ParseError {
-
-    private final Expression expression;
-
-    public InvalidFieldAccess(RuleLangParser.NestedContext ctx,
-                              Expression expression) {
-        super("invalid_field_access", ctx);
-        this.expression = expression;
-    }
-
-    @JsonProperty("reason")
-    @Override
-    public String toString() {
-        return "Error accessing map field " + expression.toString() + ". Please use either dot or square bracket notation" + positionString();
-    }
-}