diff --git a/src/read.c b/src/read.c
index 82406d6..4ea10a9 100644
--- a/src/read.c
+++ b/src/read.c
@@ -97,6 +97,13 @@ int32_t aaruf_read_media_tag(void *context, uint8_t *data, const int32_t tag, ui
         return AARUF_ERROR_NOT_AARUFORMAT;
     }
 
+    if(length == NULL)
+    {
+        FATAL("Invalid length pointer");
+        TRACE("Exiting aaruf_read_media_tag() = AARUF_ERROR_INCORRECT_DATA_SIZE");
+        return AARUF_ERROR_INCORRECT_DATA_SIZE;
+    }
+
     const aaruformatContext *ctx = context;
 
     // Not a libaaruformat context
@@ -269,6 +276,14 @@ int32_t aaruf_read_sector(void *context, const uint64_t sector_address, bool neg
 
     ctx = context;
 
+    if(length == NULL)
+    {
+        FATAL("Invalid length pointer");
+
+        TRACE("Exiting aaruf_read_sector() = AARUF_ERROR_INCORRECT_DATA_SIZE");
+        return AARUF_ERROR_INCORRECT_DATA_SIZE;
+    }
+
     // Not a libaaruformat context
     if(ctx->magic != AARU_MAGIC)
     {
@@ -640,6 +655,14 @@ int32_t aaruf_read_track_sector(void *context, uint8_t *data, const uint64_t sec
 
     aaruformatContext *ctx = context;
 
+    if(length == NULL)
+    {
+        FATAL("Invalid length pointer");
+
+        TRACE("Exiting aaruf_read_track_sector() = AARUF_ERROR_INCORRECT_DATA_SIZE");
+        return AARUF_ERROR_INCORRECT_DATA_SIZE;
+    }
+
     // Not a libaaruformat context
     if(ctx->magic != AARU_MAGIC)
     {
@@ -793,6 +816,14 @@ int32_t aaruf_read_sector_long(void *context, const uint64_t sector_address, boo
 
     ctx = context;
 
+    if(length == NULL)
+    {
+        FATAL("Invalid length pointer");
+
+        TRACE("Exiting aaruf_read_sector_long() = AARUF_ERROR_INCORRECT_DATA_SIZE");
+        return AARUF_ERROR_INCORRECT_DATA_SIZE;
+    }
+
     // Not a libaaruformat context
     if(ctx->magic != AARU_MAGIC)
     {
@@ -1290,6 +1321,14 @@ int32_t aaruf_read_sector_tag(const void *context, const uint64_t sector_address
 
     ctx = context;
 
+    if(length == NULL)
+    {
+        FATAL("Invalid length pointer");
+
+        TRACE("Exiting aaruf_read_sector_tag() = AARUF_ERROR_INCORRECT_DATA_SIZE");
+        return AARUF_ERROR_INCORRECT_DATA_SIZE;
+    }
+
     // Not a libaaruformat context
     if(ctx->magic != AARU_MAGIC)
     {