diff --git a/R/Aaaa.R b/R/Aaaa.R
index 9bfee4d2..6aa58214 100644
--- a/R/Aaaa.R
+++ b/R/Aaaa.R
@@ -82,6 +82,10 @@ block_list <- c("ENV", "PROB", "PARAM", "INIT",
                 "PREAMBLE", "PRED", "BLOCK", "TRANSIT", "YAML", "NMEXT", 
                 "INPUT", "EVENT")
 
+block_list_single <- c("MAIN", "SET", "GLOBAL", "PREAMBLE", "PRED", "PKMODEL", 
+                       "ENV", "CMTN", "INCLUDE", "NAMESPACE", "BLOCK", 
+                       "TRANSIT", "YAML", "EVENT")
+
 Reserved_cvar <- c("SOLVERTIME","table","ETA","EPS", "AMT", "CMT",
                    "ID", "TIME", "EVID","simeps", "self", "simeta",
                    "NEWIND", "DONE", "CFONSTOP", "DXDTZERO",
diff --git a/R/modspec.R b/R/modspec.R
index 2f8ce692..9bfc9f97 100644
--- a/R/modspec.R
+++ b/R/modspec.R
@@ -156,16 +156,17 @@ check_sim_eta_eps_n <- function(x, spec) {
   return(invisible(NULL))
 }
 
-check_spec_contents <- function(x, crump = TRUE, warn = TRUE, ...) {
-  invalid <- setdiff(x,block_list)
-  valid <- intersect(x,block_list)
-  
-  if(sum("MAIN"  == x) > 1){
-    stop("Only one $MAIN block allowed in the model.",call.=FALSE)
-  }
-  
-  if(sum("SET" == x) > 1) {
-    stop("Only one $SET block allowed in the model.", call.=FALSE)
+check_spec_contents <-  function(x, crump = TRUE, warn = TRUE, ...) {
+  # Check for valid and invalid blocks
+  invalid <- base::setdiff(x, block_list)
+  valid <- base::intersect(x, block_list)
+  
+  # Check for block duplicates where we only allow single 
+  dup_x <- x[duplicated(x)]
+  dups <- base::intersect(dup_x, block_list_single)
+  if(length(dups)) {
+    names(dups) <- rep("*", length(dups))
+    abort("Multiple blocks found where only one is allowed:", body = dups)  
   }
   
   if(warn) {
diff --git a/R/mread.R b/R/mread.R
index e340fdbe..080cbccf 100644
--- a/R/mread.R
+++ b/R/mread.R
@@ -283,7 +283,12 @@ mread <- function(model, project = getOption("mrgsolve.project", getwd()),
   # Collect potential multiples
   subr  <- collect_subr(spec)
   table <- unlist(spec[names(spec)=="TABLE"], use.names = FALSE)
-  spec[["ODE"]] <- unlist(spec[names(spec)=="ODE"], use.names = FALSE)
+  if("ODE" %in% names(spec)) {
+    spec[["ODE"]] <- unlist(spec[names(spec)=="ODE"], use.names = FALSE)
+  }
+  if("PLUGIN" %in% names(spec)) {
+    spec[["PLUGIN"]] <- unlist(spec[names(spec)=="PLUGIN"], use.names = FALSE)
+  }
   
   # TODO: deprecate audit argument
   mread.env[["audit_dadt"]] <- 
@@ -432,7 +437,7 @@ mread <- function(model, project = getOption("mrgsolve.project", getwd()),
     x <- update_capture(x, .ren.chr(capture_vars))
     build$preclean <- TRUE
   }
-
+  
   # Check mod ----
   check_pkmodel(x, subr, spec)
   check_globals(mread.env[["move_global"]], Cmt(x))
@@ -561,7 +566,7 @@ mread <- function(model, project = getOption("mrgsolve.project", getwd()),
     from = temp_write,
     to = build[["compfile"]]
   )
-
+  
   if(!compile) return(x)
   
   if(ignore.stdout & !quiet) {
diff --git a/tests/testthat/test-modspec.R b/tests/testthat/test-modspec.R
index 1a825d65..3d11057a 100644
--- a/tests/testthat/test-modspec.R
+++ b/tests/testthat/test-modspec.R
@@ -96,6 +96,36 @@ for(what in c("THETA", "PARAM", "CMT",
   })
 }
 
+test_that("multiple blocks allowed or not allowed", {
+  
+  for(bl in mrgsolve:::block_list_single) {
+    code <- glue::glue("${bl} end = 5\n${bl} delta = 1\n$PARAM x = 3")  
+    model <- glue::glue("test-multiple-{tolower(bl)}")
+    expect_error(
+      mcode(model, code, compile = FALSE), 
+      "Multiple blocks found"
+    )
+  }
+  
+  code <- "$PLUGIN Rcpp\n$PLUGIN BH evtools\n$PARAM x = 3"
+  expect_silent(
+    mod <- mcode("test-multiple-plugin", code, compile = FALSE)
+  )
+  expect_is(mod, "mrgmod")
+  
+  code <- "$ODE a = 3\n$ODE b = 55\n$PARAM x = 3"
+  expect_silent(
+    mod <- mcode("test-multiple-ode", code, compile = FALSE)
+  )
+  expect_is(mod, "mrgmod")
+  
+  code <- "$TABLE x\n$TABLE y = 55\n$PARAM x = 3\n y = 10"
+  expect_silent(
+    mod <- mcode("test-multiple-table", code, compile = FALSE)
+  )
+  expect_is(mod, "mrgmod")
+})
+
 test_that("Commented model", {
   code <- '
   // A comment