diff --git a/IDEA/build.gradle.kts b/IDEA/build.gradle.kts
index f93ff00..60ddae3 100644
--- a/IDEA/build.gradle.kts
+++ b/IDEA/build.gradle.kts
@@ -41,7 +41,7 @@ kotlin {
 
 dependencies {
     intellijPlatform {
-        intellijIdeaCommunity("2025.1.1.1")
+        intellijIdeaCommunity("2024.3.4.1")
 
         bundledPlugins(listOf("com.intellij.java"))
 
@@ -68,10 +68,10 @@ intellijPlatform {
     pluginConfiguration {
         // ...
 
-        version = "1.4.0.2"
+        version = "1.4.0.3"
 
         ideaVersion {
-            sinceBuild = "251.25410.129"
+            sinceBuild = "243.25659.59"
             untilBuild = provider { null }
         }
     }
diff --git a/IDEA/src/main/grammar/KerboScript.bnf b/IDEA/src/main/grammar/KerboScript.bnf
index eb03e12..a56bf6d 100644
--- a/IDEA/src/main/grammar/KerboScript.bnf
+++ b/IDEA/src/main/grammar/KerboScript.bnf
@@ -134,7 +134,7 @@ instruction ::= !(CURLYCLOSE | <<eof>>) instruction_inner {
   pin = 1
   recoverWhile = instruction_recover
 }
-private instruction_first ::= ADD | BREAK | CLEARSCREEN | COMPILE | COPY | DECLARE | DELETE | EDIT | FOR | FROM
+private instruction_first ::= ADD | BREAK | CLEARSCREEN | COMPILE | COPY | CURLYOPEN | DECLARE | DELETE | EDIT | FOR | FROM
     | FUNCTION | GLOBAL | IF | LIST | LOCAL | LOCK | LOG | ON | PARAMETER | PRESERVE | PRINT | REBOOT | REMOVE | RENAME
     | RETURN | RUN | RUNONCEPATH | RUNPATH | SET | SHUTDOWN | STAGE | SWITCH | TOGGLE | UNLOCK | UNSET | UNTIL | WAIT
     | WHEN | COMMENTLINE | ident
diff --git a/IDEA/src/test/testData/parsing/ErrorRecovery.ks b/IDEA/src/test/testData/parsing/ErrorRecovery.ks
index eecdeaa..ef9a8e9 100644
--- a/IDEA/src/test/testData/parsing/ErrorRecovery.ks
+++ b/IDEA/src/test/testData/parsing/ErrorRecovery.ks
@@ -9,3 +9,11 @@ IF foo {
     PRINT
 }
 LOCAL baz TO 0.
+
+function test{
+    print "begin".
+    { // Error highlighted here: '{' Unexpected
+        print "inside a code block".
+    }
+    print "end".
+}
\ No newline at end of file
diff --git a/IDEA/src/test/testData/parsing/ErrorRecovery.txt b/IDEA/src/test/testData/parsing/ErrorRecovery.txt
index bf89bdd..b92f2d1 100644
--- a/IDEA/src/test/testData/parsing/ErrorRecovery.txt
+++ b/IDEA/src/test/testData/parsing/ErrorRecovery.txt
@@ -1,4 +1,4 @@
-FILE(0,195)
+FILE(0,340)
   PsiComment(COMMENTLINE)('// Testing instruction recovery')(0,31)
   PsiWhiteSpace('\n')(31,32)
   KerboScriptInstructionImpl(INSTRUCTION)(32,32)
@@ -152,4 +152,47 @@ FILE(0,195)
         KerboScriptAtomImpl(ATOM)(193,194)
           KerboScriptNumberImpl(NUMBER)(193,194)
             PsiElement(INTEGER)('0')(193,194)
-      PsiElement(.)('.')(194,195)
\ No newline at end of file
+      PsiElement(.)('.')(194,195)
+  PsiWhiteSpace('\n\n')(195,197)
+  KerboScriptDeclareStmtImpl(DECLARE_STMT)(197,340)
+    KerboScriptDeclareFunctionClauseImpl(DECLARE_FUNCTION_CLAUSE)(197,340)
+      PsiElement(FUNCTION)('function')(197,205)
+      PsiWhiteSpace(' ')(205,206)
+      KerboScriptIdentImpl(IDENT)(206,210)
+        PsiElement(IDENTIFIER)('test')(206,210)
+      KerboScriptInstructionBlockImpl(INSTRUCTION_BLOCK)(210,340)
+        PsiElement({)('{')(210,211)
+        PsiWhiteSpace('\n    ')(211,216)
+        KerboScriptPrintStmtImpl(PRINT_STMT)(216,230)
+          PsiElement(PRINT)('print')(216,221)
+          PsiWhiteSpace(' ')(221,222)
+          KerboScriptSuffixtermImpl(SUFFIXTERM)(222,229)
+            KerboScriptAtomImpl(ATOM)(222,229)
+              PsiElement(STRING)('"begin"')(222,229)
+          PsiElement(.)('.')(229,230)
+        PsiWhiteSpace('\n    ')(230,235)
+        KerboScriptInstructionImpl(INSTRUCTION)(235,321)
+          KerboScriptInstructionBlockImpl(INSTRUCTION_BLOCK)(235,321)
+            PsiElement({)('{')(235,236)
+            PsiWhiteSpace(' ')(236,237)
+            PsiComment(COMMENTLINE)('// Error highlighted here: '{' Unexpected')(237,278)
+            PsiWhiteSpace('\n        ')(278,287)
+            KerboScriptPrintStmtImpl(PRINT_STMT)(287,315)
+              PsiElement(PRINT)('print')(287,292)
+              PsiWhiteSpace(' ')(292,293)
+              KerboScriptSuffixtermImpl(SUFFIXTERM)(293,314)
+                KerboScriptAtomImpl(ATOM)(293,314)
+                  PsiElement(STRING)('"inside a code block"')(293,314)
+              PsiElement(.)('.')(314,315)
+            PsiWhiteSpace('\n    ')(315,320)
+            PsiElement(})('}')(320,321)
+        PsiWhiteSpace('\n    ')(321,326)
+        KerboScriptPrintStmtImpl(PRINT_STMT)(326,338)
+          PsiElement(PRINT)('print')(326,331)
+          PsiWhiteSpace(' ')(331,332)
+          KerboScriptSuffixtermImpl(SUFFIXTERM)(332,337)
+            KerboScriptAtomImpl(ATOM)(332,337)
+              PsiElement(STRING)('"end"')(332,337)
+          PsiElement(.)('.')(337,338)
+        PsiWhiteSpace('\n')(338,339)
+        PsiElement(})('}')(339,340)
\ No newline at end of file